* src/base/ftobjs.c (FT_Request_Metrics): Avoid division by zero.

The division-by-zero might happen in broken fonts (see #1194).
Instead of returning a huge number from FT_DivFix until and failing
to scale later, we now bail immediately.

src/base/ftobjs.c

@@ -3276,6 +3276,14 @@
       if ( h < 0 )
         h = -h;
 
+      if ( ( !w && req->width )                     ||
+           ( !h && ( req->height || !req->width ) ) )
+      {
+        FT_ERROR(( "FT_Request_Metrics: Divide by zero\n" ));
+        error = FT_ERR( Divide_By_Zero );
+        goto Exit;
+      }
+
       scaled_w = FT_REQUEST_WIDTH ( req );
       scaled_h = FT_REQUEST_HEIGHT( req );