j2kdec: use correct printf format.

Signed-off-by: Nicolas George <nicolas.george@normalesup.org>
Signed-off-by: Michael Niedermayer <michaelni@gmx.at>

libavcodec/j2kdec.c

@@ -948,7 +948,7 @@ static int decode_codestream(J2kDecoderContext *s)
                 // the comment is ignored
                 s->buf += len - 2; break;
             default:
-                av_log(s->avctx, AV_LOG_ERROR, "unsupported marker 0x%.4X at pos 0x%x\n", marker, s->buf - s->buf_start - 4);
+                av_log(s->avctx, AV_LOG_ERROR, "unsupported marker 0x%.4X at pos 0x%tx\n", marker, s->buf - s->buf_start - 4);
                 s->buf += len - 2; break;
         }
         if (s->buf - oldbuf != len || ret){