scripts/coccinelle/free: add NULL test before dev_{put, hold} functions

// SPDX-License-Identifier: GPL-2.0-only

/// Since commit b37a46683739 ("netdevice: add the case if dev is NULL"),

/// NULL check before dev_{put, hold} functions is not needed.

///

/// Based on ifnullfree.cocci by Fabian Frederick.

///

// Copyright: (C) 2022 Ziyang Xuan.

// Comments: -

// Options: --no-includes --include-headers

virtual patch

virtual org

virtual report

virtual context

@r2 depends on patch@

expression E;

@@

- if (E != NULL)

(

  __dev_put(E);

|

  dev_put(E);

|

  dev_put_track(E, ...);

|

  __dev_hold(E);

|

  dev_hold(E);

|

  dev_hold_track(E, ...);

)

@r depends on context || report || org @

expression E;

position p;

@@

* if (E != NULL)

*	\(__dev_put@p\|dev_put@p\|dev_put_track@p\|__dev_hold@p\|dev_hold@p\|

*         dev_hold_track@p\)(E, ...);

@script:python depends on org@

p << r.p;

@@

cocci.print_main("NULL check before dev_{put, hold} functions is not needed", p)

@script:python depends on report@

p << r.p;

@@

msg = "WARNING: NULL check before dev_{put, hold} functions is not needed."

coccilib.report.print_report(p[0], msg)