net/inetdevice: bad_mask can be boolean

This patch makes bad_mask return bool due to this particular function
only using either one or zero as its return value.

No functional change.
Signed-off-by: Yaowei Bai <bywxiaobai@163.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

include/linux/inetdevice.h

@@ -180,15 +180,15 @@ static __inline__ bool inet_ifa_match(__be32 addr, struct in_ifaddr *ifa)
  *	Check if a mask is acceptable.
  */
  
-static __inline__ int bad_mask(__be32 mask, __be32 addr)
+static __inline__ bool bad_mask(__be32 mask, __be32 addr)
 {
 	__u32 hmask;
 	if (addr & (mask = ~mask))
-		return 1;
+		return true;
 	hmask = ntohl(mask);
 	if (hmask & (hmask+1))
-		return 1;
-	return 0;
+		return true;
+	return false;
 }
 
 #define for_primary_ifa(in_dev)	{ struct in_ifaddr *ifa; \