of: unittest: Fix compile in the non-dynamic case

mainline inclusion
from mainline-v6.8-rc5
commit 607aad1e4356c210dbef9022955a3089377909b2
category: bugfix
bugzilla: https://gitee.com/openeuler/kernel/issues/I970CO


CVE: NA

--------------------------------

If CONFIG_OF_KOBJ is not set, a device_node does not contain a
kobj and attempts to access the embedded kobj via kref_read break
the compile.

Replace affected kref_read calls with a macro that reads the
refcount if it exists and returns 1 if there is no embedded kobj.

Reported-by: kernel test robot <lkp@intel.com>
Closes: https://lore.kernel.org/oe-kbuild-all/202401291740.VP219WIz-lkp@intel.com/


Fixes: 4dde83569832 ("of: Fix double free in of_parse_phandle_with_args_map")
Signed-off-by: Christian A. Ehrhardt <lk@c--e.de>
Link: https://lore.kernel.org/r/20240129192556.403271-1-lk@c--e.de


Signed-off-by: Rob Herring <robh@kernel.org>
Conflicts:
	drivers/of/unittest.c
Signed-off-by: Yongqiang Liu <liuyongqiang13@huawei.com>