Guards can help to make the code more readable. So use it wherever they
do so.

On many places labels and 'ret' locals are eliminated completely.
Signed-off-by: Jiri Slaby (SUSE) <jirislaby@kernel.org>
Link: https://lore.kernel.org/r/20240808103549.429349-2-jirislaby@kernel.orgSigned-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>