While fstr_real_len is only being used under if (encrypted),
gcc-6 still warns.

Fixes this false positive:
fs/ubifs/dir.c: In function 'ubifs_readdir':
fs/ubifs/dir.c:629:13: warning: 'fstr_real_len' may be used
uninitialized in this function [-Wmaybe-uninitialized]
    fstr.len = fstr_real_len

Initialize fstr_real_len to make gcc happy.

Reported-by: Stephen Rothwell <redacted>
Signed-off-by: Richard Weinberger <richard@nod.at>
---
 fs/ubifs/dir.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/fs/ubifs/dir.c b/fs/ubifs/dir.c
index 7f01f3d2ac3b..1c5331ac9614 100644
--- a/fs/ubifs/dir.c
+++ b/fs/ubifs/dir.c

@@ -528,7 +528,7 @@ static unsigned int vfs_dent_type(uint8_t type)
  */
 static int ubifs_readdir(struct file *file, struct dir_context *ctx)
 {
-	int fstr_real_len, err = 0;
+	int fstr_real_len = 0, err = 0;
 	struct fscrypt_name nm;
 	struct fscrypt_str fstr = {0};
 	union ubifs_key key;

-- 
2.10.2