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hcom: limit input size to 2G samples

Better to refuse longer inputs than doing something weird in the
compression code.

--- a/src/hcom.c

+++ b/src/hcom.c

@@ -284,6 +284,14 @@

   if (len == 0)

     return 0;

+  if (p->pos == INT32_MAX)

+    return SOX_EOF;

+

+  if (p->pos + len > INT32_MAX) {

+    lsx_warn("maximum file size exceeded");

+    len = INT32_MAX - p->pos;

+  }

+

   if (p->pos + len > p->size) {

     p->size = ((p->pos + len) / BUFINCR + 1) * BUFINCR;

     p->data = lsx_realloc(p->data, p->size);