ext4: fix memory leak in ext4_fill_super

syzbot reported memory leak in ext4 subsyetem.
The problem was in case sbi->s_mmp_tsk hasn’t started
at the time of kthread_stop() call. In that case data allocated
for this thread won't be freed.

Reported-by: syzbot+d9e482e303930fa4f6ff@syzkaller.appspotmail.com
Signed-off-by: Pavel Skripkin <paskripkin@gmail.com>
Change-Id: Iad957917c0cbaa52dfbe677b6fe0d1635da9c2bf
1 file changed