supress warning

Author: w43322

modules/ximgproc/src/guided_filter.cpp

@@ -714,8 +714,8 @@ void GuidedFilterImpl::init(InputArray guide, int radius_, double eps_, double s
     gCnNum = (int)guideCnOriginal.size();
     hOriginal = guideCnOriginal[0].rows;
     wOriginal = guideCnOriginal[0].cols;
-    h = hOriginal / scale;
-    w = wOriginal / scale;
+    h = int(hOriginal / scale);
+    w = int(wOriginal / scale);
 
     parConvertToWorkType(guideCnOriginal, guideCnOriginal);
     if (scale > 1.0) {