4xm: remove unneeded check for remaining unused data.

This is unnecessary complication that only prints a message and does not
affect decoding.

libavcodec/4xm.c

@@ -415,15 +415,6 @@ static int decode_p_frame(FourXContext *f, const uint8_t *buf, int length){
         dst += 8*stride;
     }
 
-    if(   bitstream_size != (get_bits_count(&f->gb)+31)/32*4
-       || (((const char*)f->wordstream - (const char*)buf + 2)&~2) != extra + bitstream_size + wordstream_size
-       || (((const char*)f->bytestream - (const char*)buf + 3)&~3) != extra + bitstream_size + wordstream_size + bytestream_size)
-        av_log(f->avctx, AV_LOG_ERROR, " %d %td %td bytes left\n",
-            bitstream_size - (get_bits_count(&f->gb)+31)/32*4,
-            -(((const char*)f->bytestream - (const char*)buf + 3)&~3) + (extra + bitstream_size + wordstream_size + bytestream_size),
-            -(((const char*)f->wordstream - (const char*)buf + 2)&~2) + (extra + bitstream_size + wordstream_size)
-        );
-
     return 0;
 }