ecryptfs: Return an error code only as a constant in ecryptfs_add_global_auth_tok()

* Return an error code without storing it in an intermediate variable.

* Delete the jump target "out" and the local variable "rc"
  which became unnecessary with this refactoring.

Signed-off-by: Markus Elfring <elfring@users.sourceforge.net>
Signed-off-by: Tyler Hicks <tyhicks@canonical.com>

fs/ecryptfs/keystore.c

@@ -2526,14 +2526,12 @@ ecryptfs_add_global_auth_tok(struct ecryptfs_mount_crypt_stat *mount_crypt_stat,
 			     char *sig, u32 global_auth_tok_flags)
 {
 	struct ecryptfs_global_auth_tok *new_auth_tok;
-	int rc = 0;
 
 	new_auth_tok = kmem_cache_zalloc(ecryptfs_global_auth_tok_cache,
 					GFP_KERNEL);
-	if (!new_auth_tok) {
-		rc = -ENOMEM;
-		goto out;
-	}
+	if (!new_auth_tok)
+		return -ENOMEM;
+
 	memcpy(new_auth_tok->sig, sig, ECRYPTFS_SIG_SIZE_HEX);
 	new_auth_tok->flags = global_auth_tok_flags;
 	new_auth_tok->sig[ECRYPTFS_SIG_SIZE_HEX] = '\0';
@@ -2541,7 +2539,6 @@ ecryptfs_add_global_auth_tok(struct ecryptfs_mount_crypt_stat *mount_crypt_stat,
 	list_add(&new_auth_tok->mount_crypt_stat_list,
 		 &mount_crypt_stat->global_auth_tok_list);
 	mutex_unlock(&mount_crypt_stat->global_auth_tok_list_mutex);
-out:
-	return rc;
+	return 0;
 }