inotify: use fsnotify group lock helpers

inotify inode marks pin the inode so there is no need to set the
FSNOTIFY_GROUP_NOFS flag.

Link: https://lore.kernel.org/r/20220422120327.3459282-8-amir73il@gmail.com


Suggested-by: Jan Kara <jack@suse.cz>
Link: https://lore.kernel.org/r/20220321112310.vpr7oxro2xkz5llh@quack3.lan/


Signed-off-by: Amir Goldstein <amir73il@gmail.com>
Signed-off-by: Jan Kara <jack@suse.cz>