h264: namespace the decode function

Make much easier debugging.

libavcodec/h264.c

@@ -4853,8 +4853,8 @@ static int output_frame(H264Context *h, AVFrame *dst, AVFrame *src)
     return 0;
 }
 
-static int decode_frame(AVCodecContext *avctx, void *data,
-                        int *got_frame, AVPacket *avpkt)
+static int h264_decode_frame(AVCodecContext *avctx, void *data,
+                             int *got_frame, AVPacket *avpkt)
 {
     const uint8_t *buf = avpkt->data;
     int buf_size       = avpkt->size;
@@ -4989,7 +4989,7 @@ AVCodec ff_h264_decoder = {
     .priv_data_size        = sizeof(H264Context),
     .init                  = ff_h264_decode_init,
     .close                 = h264_decode_end,
-    .decode                = decode_frame,
+    .decode                = h264_decode_frame,
     .capabilities          = /*CODEC_CAP_DRAW_HORIZ_BAND |*/ CODEC_CAP_DR1 |
                              CODEC_CAP_DELAY | CODEC_CAP_SLICE_THREADS |
                              CODEC_CAP_FRAME_THREADS,