mpegvideo: fix motion_val checks

Fixes CID604124
Signed-off-by: Michael Niedermayer <michaelni@gmx.at>

libavcodec/mpegvideo.c

@@ -1780,7 +1780,7 @@ void ff_print_debug_info(MpegEncContext *s, AVFrame *pict)
             int mb_x;
             for (mb_x = 0; mb_x < s->mb_width; mb_x++) {
                 const int mb_index = mb_x + mb_y * s->mb_stride;
-                if ((s->avctx->debug_mv) && pict->motion_val) {
+                if ((s->avctx->debug_mv) && pict->motion_val[0]) {
                     int type;
                     for (type = 0; type < 3; type++) {
                         int direction = 0;
@@ -1859,7 +1859,7 @@ void ff_print_debug_info(MpegEncContext *s, AVFrame *pict)
                         }
                     }
                 }
-                if ((s->avctx->debug & FF_DEBUG_VIS_QP) && pict->motion_val) {
+                if ((s->avctx->debug & FF_DEBUG_VIS_QP)) {
                     uint64_t c = (pict->qscale_table[mb_index] * 128 / 31) *
                                  0x0101010101010101ULL;
                     int y;
@@ -1873,7 +1873,7 @@ void ff_print_debug_info(MpegEncContext *s, AVFrame *pict)
                     }
                 }
                 if ((s->avctx->debug & FF_DEBUG_VIS_MB_TYPE) &&
-                    pict->motion_val) {
+                    pict->motion_val[0]) {
                     int mb_type = pict->mb_type[mb_index];
                     uint64_t u,v;
                     int y;