imgproc: fix using of uninitialized edge[] members in FillConvexPoly

modules/imgproc/src/drawing.cpp

@@ -1171,6 +1171,9 @@ FillConvexPoly( Mat& img, const Point2l* v, int npts, const void* color, int lin
     edge[0].di = 1;
     edge[1].di = npts - 1;
 
+    edge[0].x = edge[1].x = -XY_ONE;
+    edge[0].dx = edge[1].dx = 0;
+
     ptr += img.step*y;
 
     do
@@ -1213,6 +1216,9 @@ FillConvexPoly( Mat& img, const Point2l* v, int npts, const void* color, int lin
             }
         }
 
+        if (edges < 0)
+            break;
+
         if (y >= 0)
         {
             int left = 0, right = 1;