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src/io/{source_wavread,sink_wavwrite}.c: declare internal functions as static

--- a/src/io/sink_wavwrite.c

+++ b/src/io/sink_wavwrite.c

@@ -68,8 +68,12 @@

   unsigned short *scratch_data;

 };

-unsigned char *write_little_endian (unsigned int s, unsigned char *str, unsigned int length);

-unsigned char *write_little_endian (unsigned int s, unsigned char *str, unsigned int length) {

+static unsigned char *write_little_endian (unsigned int s, unsigned char *str,

+    unsigned int length);

+

+static unsigned char *write_little_endian (unsigned int s, unsigned char *str,

+    unsigned int length)

+{

   uint_t i;

   for (i = 0; i < length; i++) {

     str[i] = s >> (i * 8);

--- a/src/io/source_wavread.c

+++ b/src/io/source_wavread.c

@@ -60,8 +60,12 @@

   fmat_t *output;

 };

-unsigned int read_little_endian (unsigned char *buf, unsigned int length);

-unsigned int read_little_endian (unsigned char *buf, unsigned int length) {

+static unsigned int read_little_endian (unsigned char *buf,

+    unsigned int length);

+

+static unsigned int read_little_endian (unsigned char *buf,

+    unsigned int length)

+{

   uint_t i, ret = 0;

   for (i = 0; i < length; i++) {

     ret += buf[i] << (i * 8);