cxl/region: Fix cxlr_pmem leaks

jira LE-1907
cve CVE-2024-38391
Rebuild_History Non-Buildable kernel-5.14.0-427.31.1.el9_4
commit-author Li Zhijian <lizhijian@fujitsu.com>
commit 1c987cf

Before this error path, cxlr_pmem pointed to a kzalloc() memory, free
it to avoid this memory leaking.

Fixes: f17b558 ("cxl/pmem: Refactor nvdimm device registration, delete the workqueue")
	Signed-off-by: Li Zhijian <lizhijian@fujitsu.com>
	Reviewed-by: Dan Williams <dan.j.williams@intel.com>
	Reviewed-by: Jonathan Cameron <Jonathan.Cameron@huawei.com>
Link: https://lore.kernel.org/r/20240428030748.318985-1-lizhijian@fujitsu.com
	Signed-off-by: Dave Jiang <dave.jiang@intel.com>
(cherry picked from commit 1c987cf)
	Signed-off-by: Jonathan Maple <jmaple@ciq.com>

Author: PlaidCat

drivers/cxl/core/region.c

@@ -2279,6 +2279,7 @@ static struct cxl_pmem_region *cxl_pmem_region_alloc(struct cxl_region *cxlr)
 		if (i == 0) {
 			cxl_nvb = cxl_find_nvdimm_bridge(cxlmd);
 			if (!cxl_nvb) {
+				kfree(cxlr_pmem);
 				cxlr_pmem = ERR_PTR(-ENODEV);
 				goto out;
 			}