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gsrt: pad to even sample count with silence [bug #312]

The sample value for silence depends on the encoding.  Use the
appropriate value for the encoding in use rather than a literal
zero byte.

--- a/src/gsrt.c

+++ b/src/gsrt.c

@@ -157,8 +157,10 @@

 {

   long num_samples = ft->tell_off - HEADER_SIZE;

-  if (num_samples & 1)

-    lsx_writeb(ft, 0);

+  if (num_samples & 1) {

+    sox_sample_t pad = 0;

+    lsx_rawwrite(ft, &pad, 1);

+  }

   if (ft->seekable) {

     unsigned i, file_size = ft->tell_off >> 1;