security/capability.h: cap_issubset/isclear can be boolean

This patch makes cap_issubset/isclear return bool due to these
functions only using either one or zero as their return
value.

No functional change.

Signed-off-by: Yaowei Bai <[e-mail]>
Acked-by: Serge Hallyn <[e-mail]>
Signed-off-by: James Morris <[e-mail]>

include/linux/capability.h

···
 	return dest;
 }
 
-static inline int cap_isclear(const kernel_cap_t a)
+static inline bool cap_isclear(const kernel_cap_t a)
 {
 	unsigned __capi;
 	CAP_FOR_EACH_U32(__capi) {
 		if (a.cap[__capi] != 0)
-			return 0;
+			return false;
 	}
-	return 1;
+	return true;
 }
 
 /*
  * Check if "a" is a subset of "set".
- * return 1 if ALL of the capabilities in "a" are also in "set"
- *	cap_issubset(0101, 1111) will return 1
- * return 0 if ANY of the capabilities in "a" are not in "set"
- *	cap_issubset(1111, 0101) will return 0
+ * return true if ALL of the capabilities in "a" are also in "set"
+ *	cap_issubset(0101, 1111) will return true
+ * return false if ANY of the capabilities in "a" are not in "set"
+ *	cap_issubset(1111, 0101) will return false
  */
-static inline int cap_issubset(const kernel_cap_t a, const kernel_cap_t set)
+static inline bool cap_issubset(const kernel_cap_t a, const kernel_cap_t set)
 {
 	kernel_cap_t dest;
 	dest = cap_drop(a, set);