__detach_mounts(): lookup_mountpoint() can't return ERR_PTR() anymore

... not since 1e9c75fb9c ("mnt: fix __detach_mounts infinite loop")

Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
This commit is contained in:
Al Viro 2019-06-29 12:06:51 -04:00
commit adc9b5c091