fix av_dlog call with non-AVClass struct

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

libavcodec/parser.c

@@ -220,9 +220,9 @@ void av_parser_close(AVCodecParserContext *s)
 int ff_combine_frame(ParseContext *pc, int next, const uint8_t **buf, int *buf_size)
 {
     if(pc->overread){
-        av_dlog(pc, "overread %d, state:%X next:%d index:%d o_index:%d\n",
+        av_dlog(NULL, "overread %d, state:%X next:%d index:%d o_index:%d\n",
                 pc->overread, pc->state, next, pc->index, pc->overread_index);
-        av_dlog(pc, "%X %X %X %X\n", (*buf)[0], (*buf)[1], (*buf)[2], (*buf)[3]);
+        av_dlog(NULL, "%X %X %X %X\n", (*buf)[0], (*buf)[1], (*buf)[2], (*buf)[3]);
     }
 
     /* Copy overread bytes from last frame into buffer. */
@@ -272,9 +272,9 @@ int ff_combine_frame(ParseContext *pc, int next, const uint8_t **buf, int *buf_s
     }
 
     if(pc->overread){
-        av_dlog(pc, "overread %d, state:%X next:%d index:%d o_index:%d\n",
+        av_dlog(NULL, "overread %d, state:%X next:%d index:%d o_index:%d\n",
                 pc->overread, pc->state, next, pc->index, pc->overread_index);
-        av_dlog(pc, "%X %X %X %X\n", (*buf)[0], (*buf)[1],(*buf)[2],(*buf)[3]);
+        av_dlog(NULL, "%X %X %X %X\n", (*buf)[0], (*buf)[1],(*buf)[2],(*buf)[3]);
     }
 
     return 0;