vprintk use is not prefixed by a KERN_<LEVEL>,
so emit these messages at KERN_ERR level.

Using %pV can save some code and allow fs_err to
be used, so do it.
Signed-off-by: NJoe Perches <joe@perches.com>
Signed-off-by: NSteven Whitehouse <swhiteho@redhat.com>