Factor out ext4_fc_disabled(). No functional change.
Signed-off-by: NYe Bin <yebin10@huawei.com>
Reviewed-by: NJan Kara <jack@suse.cz>
Link: https://lore.kernel.org/r/20220916083836.388347-2-yebin10@huawei.comSigned-off-by: NTheodore Ts'o <tytso@mit.edu>