[PATCH] ubifs: Fix build errors as symbol undefined

[Li Hua]

When CONFIG_UBIFS_FS is enable but CONFIG_UBIFS_FS_AUTHENTICATION is not set:
    ERROR: modpost: "ubifs_bad_hash" [fs/ubifs/ubifs.ko] undefined!

Fixes: 16a26b20d2af ("ubifs: authentication: Add hashes to index nodes")
Signed-off-by: Li Hua <hucool.lihua at huawei.com>
---
 fs/ubifs/Kconfig | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/fs/ubifs/Kconfig b/fs/ubifs/Kconfig
index 45d3d207fb99..93bda1057fdc 100644
--- a/fs/ubifs/Kconfig
+++ b/fs/ubifs/Kconfig
@@ -13,6 +13,7 @@ config UBIFS_FS
 	select CRYPTO_HASH_INFO
 	select UBIFS_FS_XATTR if FS_ENCRYPTION
 	select FS_ENCRYPTION_ALGS if FS_ENCRYPTION
+	select UBIFS_FS_AUTHENTICATION
 	depends on MTD_UBI
 	help
 	  UBIFS is a file system for flash devices which works on top of UBI.
@@ -91,6 +92,7 @@ config UBIFS_FS_AUTHENTICATION
 	select KEYS
 	select CRYPTO_HMAC
 	select SYSTEM_DATA_VERIFICATION
+	select SYSTEM_TRUSTED_KEYRING
 	help
 	  Enable authentication support for UBIFS. This feature offers protection
 	  against offline changes for both data and metadata of the filesystem.
-- 
2.17.1