[PATCH v2 0/2] checkpatch: add checks incorrectly initialized pointers with __free attr

[Ally Heev <allyheev@gmail.com>]

Badly initialized pointers with __free attr can
cause cleanup issues. So,

Adding checks for
- uninitialized pointers
- initialized pointers with NULL

Testing:
ran checkpatch.pl before and after the change on 
crypto/asymmetric_keys/x509_public_key.c, which has
both initialized with NULL and uninitialized pointers

---
Changes in v2:
- change cover letter and title to reflect new changes
- fix regex to handle multiple declarations in a single line case
- convert WARN to ERROR for uninitialized pointers
- add a new WARN for pointers initialized with NULL 
- NOTE: tried handling multiple declarations on a single line by splitting
        them and matching the parts with regex, but, it turned out to be 
	complex and overkill. Moreover, multi-line declarations pose a threat
- Link to v1: https://lore.kernel.org/r/20251021-aheev-checkpatch-uninitialized-free-v1-1-18fb01bc6a7a@gmail.com

---
Ally Heev (2):
      checkpatch: add uninitialized pointer with __free attribute check
      add check for pointers with __free attribute initialized to NULL

 Documentation/dev-tools/checkpatch.rst | 11 +++++++++++
 scripts/checkpatch.pl                  | 13 +++++++++++++
 2 files changed, 24 insertions(+)
---
base-commit: 6548d364a3e850326831799d7e3ea2d7bb97ba08
change-id: 20251021-aheev-checkpatch-uninitialized-free-5c39f75e10a1

Best regards,
-- 
Ally Heev <allyheev@gmail.com>