[PATCH] swapfile: fix name leak in swapoff

[Xiaotian Feng <xtfeng@gmail.com>]

there's a name leak introduced by commit 91a27b2, add the missing
putname.

Signed-off-by: Xiaotian Feng <dannyfeng@tencent.com>
Cc: Jeff Layton <jlayton@redhat.com>
Cc: Al Viro <viro@zeniv.linux.org.uk>
---
 mm/swapfile.c |    2 ++
 1 file changed, 2 insertions(+)

diff --git a/mm/swapfile.c b/mm/swapfile.c
index 71cd288..459fe30 100644
--- a/mm/swapfile.c
+++ b/mm/swapfile.c
@@ -1608,6 +1608,8 @@ SYSCALL_DEFINE1(swapoff, const char __user *, specialfile)
 out_dput:
 	filp_close(victim, NULL);
 out:
+	if (pathname && !IS_ERR(pathname))
+		putname(pathname);
 	return err;
 }
 
-- 
1.7.9.5