char: misc: Use IS_ERR() for filp_open() return value

filp_open() never returns NULL, it returns either a valid pointer or an
error pointer. Using IS_ERR_OR_NULL() is unnecessary. Additionally, if
filp were NULL, PTR_ERR(NULL) would return 0, leading to a misleading
error message.

Fixes: 74d8361be344 ("char: misc: add test cases")
Reported-by: kernel test robot <lkp@intel.com>
Reported-by: Dan Carpenter <dan.carpenter@linaro.org>
Closes: https://lore.kernel.org/r/202506132058.thWZHlrb-lkp@intel.com/
Signed-off-by: Alper Ak <alperyasinak1@gmail.com>
Acked-by: Thadeu Lima de Souza Cascardo <cascardo@igalia.com>
Link: https://patch.msgid.link/20251226230248.113073-1-alperyasinak1@gmail.com
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

diff --git a/drivers/char/misc_minor_kunit.c b/drivers/char/misc_minor_kunit.c
index 6fc8b05169c5754b96588088471a844a2e2ee29b..e930c78e1ef97eafaee5892413bb3a29e4b147ad 100644 (file)
--- a/drivers/char/misc_minor_kunit.c
+++ b/drivers/char/misc_minor_kunit.c
@@ -166,7 +166,7 @@ static void __init miscdev_test_can_open(struct kunit *test, struct miscdevice *
                KUNIT_FAIL(test, "failed to create node\n");
 
        filp = filp_open(devname, O_RDONLY, 0);
-       if (IS_ERR_OR_NULL(filp))
+       if (IS_ERR(filp))
                KUNIT_FAIL(test, "failed to open misc device: %ld\n", PTR_ERR(filp));
        else
                fput(filp);