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examples: silence compiler warnings

--- a/src/example0.c

+++ b/src/example0.c

@@ -43,12 +43,12 @@

   assert(sox_init() == SOX_SUCCESS);

   /* Open the input file (with default parameters) */

-  assert(in = sox_open_read(argv[1], NULL, NULL, NULL));

+  assert((in = sox_open_read(argv[1], NULL, NULL, NULL)));

   /* Open the output file; we must specify the output signal characteristics.

    * Since we are using only simple effects, they are the same as the input

    * file characteristics */

-  assert(out = sox_open_write(argv[2], &in->signal, NULL, NULL, NULL, NULL));

+  assert((out = sox_open_write(argv[2], &in->signal, NULL, NULL, NULL, NULL)));

   /* Create an effects chain; some effects need to know about the input

    * or output file encoding so we provide that information here */

--- a/src/example1.c

+++ b/src/example1.c

@@ -115,12 +115,12 @@

   assert(sox_init() == SOX_SUCCESS);

   /* Open the input file (with default parameters) */

-  assert(in = sox_open_read(argv[1], NULL, NULL, NULL));

+  assert((in = sox_open_read(argv[1], NULL, NULL, NULL)));

   /* Open the output file; we must specify the output signal characteristics.

    * Since we are using only simple effects, they are the same as the input

    * file characteristics */

-  assert(out = sox_open_write(argv[2], &in->signal, NULL, NULL, NULL, NULL));

+  assert((out = sox_open_write(argv[2], &in->signal, NULL, NULL, NULL, NULL)));

   /* Create an effects chain; some effects need to know about the input

    * or output file encoding so we provide that information here */

--- a/src/example2.c

+++ b/src/example2.c

@@ -50,7 +50,7 @@

   ++argv, --argc; /* Move to 1st parameter */

   /* Open the input file (with default parameters) */

-  assert(in = sox_open_read(*argv, NULL, NULL, NULL));

+  assert((in = sox_open_read(*argv, NULL, NULL, NULL)));

   ++argv, --argc; /* Move past this parameter */

   if (argc) { /* If given, read the start time: */

@@ -75,7 +75,7 @@

   /* Make sure that this is at a `wide sample' boundary: */

   block_size -= block_size % in->signal.channels;

   /* Allocate a block of memory to store the block of audio samples: */

-  assert(buf = malloc(sizeof(sox_sample_t) * block_size));

+  assert((buf = malloc(sizeof(sox_sample_t) * block_size)));

   /* This example program requires that the audio has precisely 2 channels: */

   assert(in->signal.channels == 2);

--- a/src/example3.c

+++ b/src/example3.c

@@ -65,9 +65,9 @@

   sox_globals.verbosity = 1;

   assert(sox_init() == SOX_SUCCESS);

-  assert(in = sox_open_read(argv[1], NULL, NULL, NULL));

+  assert((in = sox_open_read(argv[1], NULL, NULL, NULL)));

   /* Change "alsa" in this line to use an alternative audio device driver: */

-  assert(out= sox_open_write("default", &in->signal, NULL, "alsa", NULL, NULL));

+  assert((out= sox_open_write("default", &in->signal, NULL, "alsa", NULL, NULL)));

   chain = sox_create_effects_chain(&in->encoding, &out->encoding);

--- a/src/example5.c

+++ b/src/example5.c

@@ -57,11 +57,11 @@

   assert(sox_init() == SOX_SUCCESS);

   /* Open the input file (with default parameters) */

-  assert(in = sox_open_read(argv[1], NULL, NULL, NULL));

+  assert((in = sox_open_read(argv[1], NULL, NULL, NULL)));

 #if defined FIXED_BUFFER

-  assert(out = sox_open_mem_write(buffer, buffer_size, &in->signal, NULL, "sox", NULL));

+  assert((out = sox_open_mem_write(buffer, buffer_size, &in->signal, NULL, "sox", NULL)));

 #else

-  assert(out = sox_open_memstream_write(&buffer, &buffer_size, &in->signal, NULL, "sox", NULL));

+  assert((out = sox_open_memstream_write(&buffer, &buffer_size, &in->signal, NULL, "sox", NULL)));

 #endif

   while ((number_read = sox_read(in, samples, MAX_SAMPLES)))

     assert(sox_write(out, samples, number_read) == number_read);

@@ -68,8 +68,8 @@

   sox_close(out);

   sox_close(in);

-  assert(in = sox_open_mem_read(buffer, buffer_size, NULL, NULL, NULL));

-  assert(out = sox_open_write(argv[2], &in->signal, NULL, NULL, NULL, NULL));

+  assert((in = sox_open_mem_read(buffer, buffer_size, NULL, NULL, NULL)));

+  assert((out = sox_open_write(argv[2], &in->signal, NULL, NULL, NULL, NULL)));

   while ((number_read = sox_read(in, samples, MAX_SAMPLES)))

     assert(sox_write(out, samples, number_read) == number_read);

   sox_close(out);

--- a/src/example6.c

+++ b/src/example6.c

@@ -86,8 +86,8 @@

   assert(argc == 3);

   assert(sox_init() == SOX_SUCCESS);

-  assert(in = sox_open_read(argv[1], NULL, NULL, NULL));

-  assert(out = sox_open_write(argv[2], &out_signal, &out_encoding, NULL, NULL, NULL));

+  assert((in = sox_open_read(argv[1], NULL, NULL, NULL)));

+  assert((out = sox_open_write(argv[2], &out_signal, &out_encoding, NULL, NULL, NULL)));

   chain = sox_create_effects_chain(&in->encoding, &out->encoding);