avfilter/vf_scale: Check ff_scale_adjust_dimensions() for failure

Helps: CID1513722 Operands don't affect result

Sponsored-by: Sovereign Tech Fund
Signed-off-by: Michael Niedermayer <michael@niedermayer.cc>

libavfilter/vf_scale.c

@@ -638,10 +638,13 @@ static int config_props(AVFilterLink *outlink)
     outlink->w = scale->w;
     outlink->h = scale->h;
 
-    ff_scale_adjust_dimensions(inlink, &outlink->w, &outlink->h,
+    ret = ff_scale_adjust_dimensions(inlink, &outlink->w, &outlink->h,
                                scale->force_original_aspect_ratio,
                                scale->force_divisible_by);
 
+    if (ret < 0)
+        goto fail;
+
     if (outlink->w > INT_MAX ||
         outlink->h > INT_MAX ||
         (outlink->h * inlink->w) > INT_MAX ||