The print of pr_err() does not come with device information, so replace it
with dev_err(). Also improve the grammar in the message.

Link: https://lore.kernel.org/r/1583940144-230800-1-git-send-email-john.garry@huawei.comSigned-off-by: Luo Jiaxing <luojiaxing@huawei.com>
Signed-off-by: John Garry <john.garry@huawei.com>
Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>