avcodec/jpeg2000dec: Print warning if the mqc pointer mismatches at the end

If this occurs on valid and correctly decoded files it should be reduced to debug
level
Signed-off-by: Michael Niedermayer <michaelni@gmx.at>

libavcodec/jpeg2000dec.c

@@ -1392,6 +1392,11 @@ static int decode_cblk(Jpeg2000DecoderContext *s, Jpeg2000CodingStyle *codsty,
         }
         pass_cnt ++;
     }
+
+    if (cblk->data + cblk->length != t1->mqc.bp) {
+        av_log(s->avctx, AV_LOG_WARNING, "End mismatch %"PTRDIFF_SPECIFIER"\n", cblk->data + cblk->length - t1->mqc.bp);
+    }
+
     return 0;
 }