CRED: fix build error due to 'tgcred' undeclared

This patch adds CONFIG_KEYS guard for tgcred to fix below build error
if CONFIG_KEYS is not configured.

  CC      kernel/cred.o
kernel/cred.c: In function 'prepare_kernel_cred':
kernel/cred.c:657: error: 'tgcred' undeclared (first use in this function)
kernel/cred.c:657: error: (Each undeclared identifier is reported only once
kernel/cred.c:657: error: for each function it appears in.)
make[1]: *** [kernel/cred.o] Error 1
make: *** [kernel] Error 2

Signed-off-by: Axel Lin <axel.lin@gmail.com>
Acked-by: David Howells <dhowells@redhat.com>
Signed-off-by: James Morris <jmorris@namei.org>

1 files changed, 2 insertions, 0 deletions

diff --git a/kernel/cred.c b/kernel/cred.c
index f1e22556bc49..d84fc910e2f3 100644
--- a/kernel/cred.c
+++ b/kernel/cred.c
@@ -656,11 +656,13 @@ struct cred *prepare_kernel_cred(struct task_struct *daemon)
         if (!new)
                 return NULL;
 
+#ifdef CONFIG_KEYS
         tgcred = kmalloc(sizeof(*tgcred), GFP_KERNEL);
         if (!tgcred) {
                 kmem_cache_free(cred_jar, new);
                 return NULL;
         }
+#endif
 
         kdebug("prepare_kernel_cred() alloc %p", new);