fix compiler warning using NS_STATIC_CAST, bug 56623, sr=attinasi@netscape.com r=dcone@netscape.com

gfx/src/nsGraphicsImpl.cpp

@@ -141,7 +141,7 @@ NS_IMETHODIMP nsGraphicsImpl::DrawString(const PRUnichar *text, nscoord x, nscoo
 
 NS_IMETHODIMP nsGraphicsImpl::SetFont(const PRUnichar *name, nscoord size)
 {
-	size *= mDev2App;
+	size = NS_STATIC_CAST(nscoord, size * mDev2App);
 	nsAutoString nameString(name);
 	nsFont font(nameString, NS_FONT_STYLE_NORMAL, NS_FONT_VARIANT_NORMAL, NS_FONT_WEIGHT_NORMAL, NS_FONT_DECORATION_NONE, size);
 	return mRenderer->SetFont(font);