Use the more common pr_warn.

Coalesce formats, realign arguments.
Signed-off-by: NJoe Perches <joe@perches.com>
Acked-by: NChris Metcalf <cmetcalf@tilera.com>
Signed-off-by: NAndrew Morton <akpm@linux-foundation.org>
Signed-off-by: NLinus Torvalds <torvalds@linux-foundation.org>