ext4: correct the error handle in ext4_fallocate()

The error out label of file_modified() should be out_inode_lock in
ext4_fallocate().

Fixes: 2890e5e0 ("ext4: move out common parts into ext4_fallocate()")
Reported-by: Baokun Li <libaokun1@huawei.com>
Signed-off-by: Zhang Yi <yi.zhang@huawei.com>
Reviewed-by: Baokun Li <libaokun1@huawei.com>
Link: https://patch.msgid.link/20250319023557.2785018-1-yi.zhang@huaweicloud.com


Signed-off-by: Theodore Ts'o <tytso@mit.edu>