cxl/test: Rework cxl_type2_mem_init() to use cxl_mock_platform_device_add()

cxl_type2_mem_init() is used to set up mock CXL type2 memory device for
cxl testing, it introduces a known bug fixed by the following commit:

commit d90f236f8b9e ("cxl/test: Update mock dev array before calling platform_device_add()")

Mock CXL devices require updating the mock device array prior to
platform_device_add(), otherwise, the CXL subsystem could fail to
recognize the newly added mock device. Switch to
cxl_mock_platform_device_add() helper to resolve this ordering issue.

Besides, this patch also includes two minor changes.
1. Preserve the original error code returned by
   cxl_mock_platform_device_add(), rather than unconditionally
   overriding it with -ENOMEM.
2. Drop redundant NULL check before platform_device_unregister(), as the
   function internally handles NULL pointer.

Fixes: 6b2e585142e6 ("cxl/test: Add hierarchy enumeration support for type2 device")
Signed-off-by: Li Ming <ming.li@zohomail.com>
Reviewed-by: Dave Jiang <dave.jiang@intel.com>
Link: https://patch.msgid.link/20260713061531.56322-1-ming.li@zohomail.com
Signed-off-by: Dave Jiang <dave.jiang@intel.com>

0 files changed, 0 insertions, 0 deletions