Move rtp_get_payload_type()'s unaltered comments to the header file.

Originally committed as revision 8233 to svn://svn.ffmpeg.org/ffmpeg/trunk

libavformat/rtp.c

@@ -207,7 +207,6 @@ int rtp_get_codec_info(AVCodecContext *codec, int payload_type)
     return -1;
 }
 
-/* return < 0 if unknown payload type */
 int rtp_get_payload_type(AVCodecContext *codec)
 {
     int i, payload_type;

libavformat/rtp.h

@@ -26,6 +26,8 @@
 
 int rtp_init(void);
 int rtp_get_codec_info(AVCodecContext *codec, int payload_type);
+
+/* return < 0 if unknown payload type */
 int rtp_get_payload_type(AVCodecContext *codec);
 
 typedef struct RTPDemuxContext RTPDemuxContext;