rtpdec_xiph: switch to av_assert()

Signed-off-by: Michael Niedermayer <michaelni@gmx.at>

libavformat/rtpdec_xiph.c

@@ -27,12 +27,11 @@
  * @author Josh Allmann <joshua.allmann@gmail.com>
  */
 
+#include "libavutil/avassert.h"
 #include "libavutil/avstring.h"
 #include "libavutil/base64.h"
 #include "libavcodec/bytestream.h"
 
-#include <assert.h>
-
 #include "rtpdec.h"
 #include "rtpdec_formats.h"
 
@@ -183,7 +182,7 @@ static int xiph_handle_packet(AVFormatContext * ctx,
         data->timestamp = *timestamp;
 
     } else {
-        assert(fragmented < 4);
+        av_assert1(fragmented < 4);
         if (data->timestamp != *timestamp) {
             // skip if fragmented timestamp is incorrect;
             // a start packet has been lost somewhere