Remove incomplete Doxygen for static decode_frame functions.

These functions are not documented for other decoders and
should be obvious enough even without Doxygen.
patch by Thilo Borgmann, thilo.borgmann googlemail com

Originally committed as revision 24237 to svn://svn.ffmpeg.org/ffmpeg/trunk

libavcodec/escape124.c

@@ -195,15 +195,6 @@ static const uint16_t mask_matrix[] = {0x1,   0x2,   0x10,   0x20,
                                        0x100, 0x200, 0x1000, 0x2000,
                                        0x400, 0x800, 0x4000, 0x8000};
 
-/**
- * Decode a single frame
- * @param avctx decoder context
- * @param data decoded frame
- * @param data_size size of the decoded frame
- * @param buf input buffer
- * @param buf_size input buffer size
- * @return 0 success, -1 on error
- */
 static int escape124_decode_frame(AVCodecContext *avctx,
                                   void *data, int *data_size,
                                   AVPacket *avpkt)

libavcodec/fraps.c

@@ -118,15 +118,6 @@ static int fraps2_decode_plane(FrapsContext *s, uint8_t *dst, int stride, int w,
     return 0;
 }
 
-/**
- * decode a frame
- * @param avctx codec context
- * @param data output AVFrame
- * @param data_size size of output data or 0 if no picture is returned
- * @param buf input data frame
- * @param buf_size size of input data frame
- * @return number of consumed bytes on success or negative if decode fails
- */
 static int decode_frame(AVCodecContext *avctx,
                         void *data, int *data_size,
                         AVPacket *avpkt)

libavcodec/rl2.c

@@ -169,15 +169,6 @@ static av_cold int rl2_decode_init(AVCodecContext *avctx)
 }
 
 
-/**
- * Decode a single frame
- * @param avctx decoder context
- * @param data decoded frame
- * @param data_size size of the decoded frame
- * @param buf input buffer
- * @param buf_size input buffer size
- * @return 0 success, -1 on error
- */
 static int rl2_decode_frame(AVCodecContext *avctx,
                               void *data, int *data_size,
                               AVPacket *avpkt)