dtpad: Use XtArgVal for int conversion

Avoid overwrite of local variables when using
short (int, etc.) types with XtVaGetValues().

Cast XtPointer using (XtArgVal) without
the need to use C99 <stdint.h> and friends.

cde/programs/dtpad/printSetup.c

@@ -614,7 +614,7 @@ _psSetupToUi(PrintSetup *pSetup)
 static void
 _psUiToSetup(PrintSetup *pSetup)
 {
-    unsigned char	isSet;
+    XtArgVal		isSet;
     Widget		frame, w;
     PrintOptions	*pOption;
     char		*marginSpec;