ref_mvs: Check for alloation fail before calling memset in av1_alloc_ref_mv_common

Signed-off-by: Derek Buitenhuis <derek.buitenhuis@gmail.com>

src/lib.c

@@ -121,6 +121,7 @@ int dav1d_open(Dav1dContext **const c_out,
             }
         }
         f->libaom_cm = av1_alloc_ref_mv_common();
+        if (!f->libaom_cm) goto error;
         if (c->n_fc > 1) {
             pthread_mutex_init(&f->frame_thread.td.lock, NULL);
             pthread_cond_init(&f->frame_thread.td.cond, NULL);

src/ref_mvs.c

@@ -3540,6 +3540,7 @@ void av1_init_ref_mv_tile_row(AV1_COMMON *cm,
 
 AV1_COMMON *av1_alloc_ref_mv_common(void) {
     AV1_COMMON *cm = malloc(sizeof(*cm));
+    if (!cm) return NULL;
     memset(cm, 0, sizeof(*cm));
     return cm;
 }