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formats: reject negative sample rate [bug #333]

Negative sample rate makes no sense and causes problems.

--- a/src/formats.c

+++ b/src/formats.c

@@ -345,8 +345,8 @@

 {

   ft->sox_errno = SOX_SUCCESS;

-  if (!ft->signal.rate) {

-    lsx_fail_errno(ft,SOX_EFMT,"sampling rate was not specified");

+  if (ft->signal.rate <= 0) {

+    lsx_fail_errno(ft, SOX_EFMT, "sample rate zero or negative");

     return SOX_EOF;

   }

   if (!ft->signal.precision) {