rtpdec_h264: Pass NAL type 0 through

According to the spec, this type shouldn't ever be used. Nevertheless,
passing it through enables decoding streams which otherwise aren't
decodeable.

Originally committed as revision 25897 to svn://svn.ffmpeg.org/ffmpeg/trunk

libavformat/rtpdec_h264.c

@@ -187,10 +187,7 @@ static int h264_handle_packet(AVFormatContext *ctx,
     if (type >= 1 && type <= 23)
         type = 1;              // simplify the case. (these are all the nal types used internally by the h264 codec)
     switch (type) {
-    case 0:                    // undefined;
+    case 0:                    // undefined, but pass them through
-        result= -1;
-        break;
-
     case 1:
         av_new_packet(pkt, len+sizeof(start_sequence));
         memcpy(pkt->data, start_sequence, sizeof(start_sequence));