inotify: Fix error return code assignment flow.

If error code is initialized -EINVAL, there is no need to assign -EINVAL.

Link: https://lore.kernel.org/r/20200426143316.29877-1-her0gyugyu@gmail.com


Signed-off-by: youngjun <her0gyugyu@gmail.com>
Signed-off-by: Jan Kara <jack@suse.cz>