mm/page_alloc.c: fix print order in show_free_areas()

Fixes: 11fb9989 ("mm: move most file-based accounting to the node")
Link: http://lkml.kernel.org/r/1490377730.30219.2.camel@beget.ru


Signed-off-by: Alexander Polyakov <apolyakov@beget.com>
Acked-by: Michal Hocko <mhocko@suse.com>
Cc: Mel Gorman <mgorman@techsingularity.net>
Cc: Vlastimil Babka <vbabka@suse.cz>
Cc: <stable@vger.kernel.org>	[4.8+]
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>