mm/page_poison.c: fix a typo in a comment

s/posioned/poisoned/

Link: http://lkml.kernel.org/r/20190721180908.6534-1-christophe.jaillet@wanadoo.frSigned-off-by: NChristophe JAILLET <christophe.jaillet@wanadoo.fr>
Reviewed-by: NAndrew Morton <akpm@linux-foundation.org>
Signed-off-by: NAndrew Morton <akpm@linux-foundation.org>
Signed-off-by: NLinus Torvalds <torvalds@linux-foundation.org>

mm/page_poison.c

@@ -101,7 +101,7 @@ static void unpoison_page(struct page *page)
 	/*
 	 * Page poisoning when enabled poisons each and every page
 	 * that is freed to buddy. Thus no extra check is done to
-	 * see if a page was posioned.
+	 * see if a page was poisoned.
 	 */
 	check_poison_mem(addr, PAGE_SIZE);
 	kunmap_atomic(addr);