mm: remove extra newline from allocation stall warning

Commit 63f53dea0c ("mm: warn about allocations which stall for too
long") by error embedded "\n" in the format string, resulting in strange
output.

  [  722.876655] kworker/0:1: page alloction stalls for 160001ms, order:0
  [  722.876656] , mode:0x2400000(GFP_NOIO)
  [  722.876657] CPU: 0 PID: 6966 Comm: kworker/0:1 Not tainted 4.8.0+ #69

Link: http://lkml.kernel.org/r/1476026219-7974-1-git-send-email-penguin-kernel@I-love.SAKURA.ne.jp
Signed-off-by: Tetsuo Handa <penguin-kernel@I-love.SAKURA.ne.jp>
Acked-by: Michal Hocko <mhocko@suse.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

mm/page_alloc.c

@@ -3658,7 +3658,7 @@ retry:
 	/* Make sure we know about allocations which stall for too long */
 	if (time_after(jiffies, alloc_start + stall_timeout)) {
 		warn_alloc(gfp_mask,
-			"page alloction stalls for %ums, order:%u\n",
+			"page allocation stalls for %ums, order:%u",
 			jiffies_to_msecs(jiffies-alloc_start), order);
 		stall_timeout += 10 * HZ;
 	}