device-dax/pmem: Convert comma to semicolon

Replace a comma between expression statements by a semicolon.

Signed-off-by: Zheng Yongjun <zhengyongjun3@huawei.com>
Link: https://lore.kernel.org/r/20201214134506.4831-1-zhengyongjun3@huawei.com


Signed-off-by: Dan Williams <dan.j.williams@intel.com>