net/nfnetlink: lockdep_nfnl_is_held can be boolean

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

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

include/linux/netfilter/nfnetlink.h

@@ -45,11 +45,11 @@ int nfnetlink_unicast(struct sk_buff *skb, struct net *net, u32 portid,
 void nfnl_lock(__u8 subsys_id);
 void nfnl_unlock(__u8 subsys_id);
 #ifdef CONFIG_PROVE_LOCKING
-int lockdep_nfnl_is_held(__u8 subsys_id);
+bool lockdep_nfnl_is_held(__u8 subsys_id);
 #else
-static inline int lockdep_nfnl_is_held(__u8 subsys_id)
+static inline bool lockdep_nfnl_is_held(__u8 subsys_id)
 {
-	return 1;
+	return true;
 }
 #endif /* CONFIG_PROVE_LOCKING */
 

net/netfilter/nfnetlink.c

@@ -64,7 +64,7 @@ void nfnl_unlock(__u8 subsys_id)
 EXPORT_SYMBOL_GPL(nfnl_unlock);
 
 #ifdef CONFIG_PROVE_LOCKING
-int lockdep_nfnl_is_held(u8 subsys_id)
+bool lockdep_nfnl_is_held(u8 subsys_id)
 {
 	return lockdep_is_held(&table[subsys_id].mutex);
 }