kernel/bpf/helpers.c:1389:29: warning: symbol 'bpf_kptr_xchg_proto' was not declared. Should it be static?

Fixes: c0a5a21c25f3 ("bpf: Allow storing referenced kptr in map")
Reported-by: kernel test robot <lkp@intel.com>
Signed-off-by: kernel test robot <lkp@intel.com>
---
 kernel/bpf/helpers.c |    2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/kernel/bpf/helpers.c b/kernel/bpf/helpers.c
index 3e709fed530612..62864d2c44e4a3 100644
--- a/kernel/bpf/helpers.c
+++ b/kernel/bpf/helpers.c
@@ -1386,7 +1386,7 @@ BPF_CALL_2(bpf_kptr_xchg, void *, map_value, void *, ptr)
  */
 #define BPF_PTR_POISON ((void *)((0xeB9FUL << 2) + POISON_POINTER_DELTA))
 
-const struct bpf_func_proto bpf_kptr_xchg_proto = {
+static const struct bpf_func_proto bpf_kptr_xchg_proto = {
 	.func         = bpf_kptr_xchg,
 	.gpl_only     = false,
 	.ret_type     = RET_PTR_TO_BTF_ID_OR_NULL,