Merge patch series "fs: ext4fs: Fix some issues found by Smatch"

Andrew Goodbody <andrew.goodbody@linaro.org> says:

Smatch reported some issues in the ext4fs code. This includes a
suggestion to use an unwind goto, to not negate a return value and to
ensure that a NULL check happens before the pointer is dereferenced.

Link: https://lore.kernel.org/r/20250704-ext4fs_fix-v1-0-5c6acf4bf839@linaro.org

diff --cc fs/ext4/ext4fs.c
Simple merge