KEYS: security_cred_alloc_blank() should return int under all circumstances

Make security_cred_alloc_blank() return int, not void, when CONFIG_SECURITY=n.
Signed-off-by: David Howells <dhowells@redhat.com>
Signed-off-by: James Morris <jmorris@namei.org>

include/linux/security.h

@@ -2309,8 +2309,10 @@ static inline int security_task_create(unsigned long clone_flags)
 	return 0;
 }
 
-static inline void security_cred_alloc_blank(struct cred *cred, gfp_t gfp)
-{ }
+static inline int security_cred_alloc_blank(struct cred *cred, gfp_t gfp)
+{
+	return 0;
+}
 
 static inline void security_cred_free(struct cred *cred)
 { }