ovl: Cleanup redundant blank lines

This patch removes redundant blanks lines in overlayfs.

Signed-off-by: hujianyang <hujianyang@huawei.com>
Signed-off-by: Miklos Szeredi <mszeredi@suse.cz>

diff --cc fs/overlayfs/copy_up.c
Simple merge

diff --cc fs/overlayfs/inode.c
Simple merge

diff --cc fs/overlayfs/super.c
Simple merge