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hcom: fix pointer type confusion [bug #308]

The compress() call fails on big endian systems with size_t bigger
than int32_t.  Fix by using the correct types.

--- a/src/hcom.c

+++ b/src/hcom.c

@@ -441,12 +441,12 @@

 {

   priv_t *p = (priv_t *) ft->priv;

   unsigned char *compressed_data = p->data;

-  size_t compressed_len = p->pos;

+  int32_t compressed_len = p->pos;

   int rc = SOX_SUCCESS;

   /* Compress it all at once */

   if (compressed_len) {

-    compress(ft, &compressed_data, (int32_t *)&compressed_len);

+    compress(ft, &compressed_data, &compressed_len);

     free(p->data);

   }