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aiff: fix reading of zero-length files [bug #310]

If we hit EOF, we should check whether an SSND chunk was seen,
even if it contains no samples.

Reported by Ross Bencina.

--- a/src/aiff.c

+++ b/src/aiff.c

@@ -88,7 +88,7 @@

   /* The SSND chunk must be the last in the file */

   while (1) {

     if (lsx_reads(ft, buf, (size_t)4) == SOX_EOF) {

-      if (ssndsize > 0)

+      if (seekto > 0)

         break;

       else {

         lsx_fail_errno(ft,SOX_EHDR,"Missing SSND chunk in AIFF file");