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wav: disallow zero-size chunks [bug #278]

A zero-size chunk is a sign of a corrupt file, so stop reading if
one is encountered.

--- a/src/wav.c

+++ b/src/wav.c

@@ -470,7 +470,7 @@

         if ((*len) % 2) (*len)++;

         /* skip to next chunk */

-        if (*len > 0 && lsx_seeki(ft, (off_t)(*len), SEEK_CUR) != SOX_SUCCESS)

+        if (!*len || lsx_seeki(ft, (off_t)(*len), SEEK_CUR) != SOX_SUCCESS)

         {

             lsx_fail_errno(ft,SOX_EHDR,

                           "WAV chunk appears to have invalid size %ld.", *len);