bpf: Silence purge_cand_cache build warning.

mainline inclusion
from mainline-5.17-rc1
commit 29f2e5bd
category: feature
bugzilla: https://gitee.com/openeuler/kernel/issues/I5EUVD
CVE: NA

Reference: https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=29f2e5bd9439445fe14ba8570b1c9a7ad682df84

-------------------------------------------------

When CONFIG_DEBUG_INFO_BTF_MODULES is not set
the following warning can be seen:
kernel/bpf/btf.c:6588:13: warning: 'purge_cand_cache' defined but not used [-Wunused-function]
Fix it.

Fixes: 1e89106d ("bpf: Add bpf_core_add_cands() and wire it into bpf_core_apply_relo_insn().")
Signed-off-by: NAlexei Starovoitov <ast@kernel.org>
Signed-off-by: NAndrii Nakryiko <andrii@kernel.org>
Link: https://lore.kernel.org/bpf/20211207014839.6976-1-alexei.starovoitov@gmail.com
(cherry picked from commit 29f2e5bd)
Signed-off-by: NWang Yufen <wangyufen@huawei.com>

kernel/bpf/btf.c

@@ -6430,6 +6430,7 @@ static struct bpf_cand_cache *populate_cand_cache(struct bpf_cand_cache *cands,
 	return new_cands;
 }
 
+#ifdef CONFIG_DEBUG_INFO_BTF_MODULES
 static void __purge_cand_cache(struct btf *btf, struct bpf_cand_cache **cache,
 			       int cache_size)
 {
@@ -6468,6 +6469,7 @@ static void purge_cand_cache(struct btf *btf)
 	__purge_cand_cache(btf, module_cand_cache, MODULE_CAND_CACHE_SIZE);
 	mutex_unlock(&cand_cache_mutex);
 }
+#endif
 
 static struct bpf_cand_cache *
 bpf_core_add_cands(struct bpf_cand_cache *cands, const struct btf *targ_btf,