wavpack: Fix possible underflow of unsigned integer variable

diff --git a/ext/wavpack/gstwavpackstreamreader.c b/ext/wavpack/gstwavpackstreamreader.c
index 074a2e7..da1fdc2 100644 (file)
--- a/ext/wavpack/gstwavpackstreamreader.c
+++ b/ext/wavpack/gstwavpackstreamreader.c
@@ -78,9 +78,10 @@ gst_wavpack_stream_reader_push_back_byte (void *id, int c)
 
   GST_DEBUG ("Pushing back one byte: 0x%x", c);
 
+  if (rid->position == 0)
+    return rid->position;
+
   rid->position -= 1;
-  if (rid->position < 0)
-    rid->position = 0;
   return rid->position;
 }