[PATCH nf-next] netfilter: core: Fix clang warnings about unused static inlines

[Lukas Wunner <lukas@wunner.de>]

Unlike gcc, clang warns about unused static inlines that are not in an
include file:

  net/netfilter/core.c:344:20: error: unused function 'nf_ingress_hook' [-Werror,-Wunused-function]
  static inline bool nf_ingress_hook(const struct nf_hook_ops *reg, int pf)
                     ^
  net/netfilter/core.c:353:20: error: unused function 'nf_egress_hook' [-Werror,-Wunused-function]
  static inline bool nf_egress_hook(const struct nf_hook_ops *reg, int pf)
                     ^

According to commit 6863f5643dd7 ("kbuild: allow Clang to find unused
static inline functions for W=1 build"), the proper resolution is to
mark the affected functions as __maybe_unused.  An alternative approach
would be to move them to include/linux/netfilter_netdev.h, but since
Pablo didn't do that in commit ddcfa710d40b ("netfilter: add
nf_ingress_hook() helper function"), I'm guessing __maybe_unused is
preferred.

This fixes both the warning introduced by Pablo in v5.10 as well as the
one recently introduced by myself with commit 42df6e1d221d ("netfilter:
Introduce egress hook").

Fixes: ddcfa710d40b ("netfilter: add nf_ingress_hook() helper function")
Reported-by: kernel test robot <lkp@intel.com>
Signed-off-by: Lukas Wunner <lukas@wunner.de>
Cc: stable@vger.kernel.org # v5.10+
---
 net/netfilter/core.c | 6 ++++--
 1 file changed, 4 insertions(+), 2 deletions(-)

diff --git a/net/netfilter/core.c b/net/netfilter/core.c
index 3a32a813fcde..6dec9cd395f1 100644
--- a/net/netfilter/core.c
+++ b/net/netfilter/core.c
@@ -341,7 +341,8 @@ static int nf_ingress_check(struct net *net, const struct nf_hook_ops *reg,
 	return 0;
 }
 
-static inline bool nf_ingress_hook(const struct nf_hook_ops *reg, int pf)
+static inline bool __maybe_unused nf_ingress_hook(const struct nf_hook_ops *reg,
+						  int pf)
 {
 	if ((pf == NFPROTO_NETDEV && reg->hooknum == NF_NETDEV_INGRESS) ||
 	    (pf == NFPROTO_INET && reg->hooknum == NF_INET_INGRESS))
@@ -350,7 +351,8 @@ static inline bool nf_ingress_hook(const struct nf_hook_ops *reg, int pf)
 	return false;
 }
 
-static inline bool nf_egress_hook(const struct nf_hook_ops *reg, int pf)
+static inline bool __maybe_unused nf_egress_hook(const struct nf_hook_ops *reg,
+						 int pf)
 {
 	return pf == NFPROTO_NETDEV && reg->hooknum == NF_NETDEV_EGRESS;
 }
-- 
2.31.1