-#define wattr_get(win,a,p,opts) ((void)((a) != 0 && (*(a) = (win)->_attrs)), \
- (void)((p) != 0 && (*(p) = PAIR_NUMBER((win)->_attrs))), \
+#define wattr_get(win,a,p,opts) ((void)((a) != (void *)0 && (*(a) = (win)->_attrs)), \
+ (void)((p) != (void *)0 && (*(p) = PAIR_NUMBER((win)->_attrs))), \