sh: handle pgtable_page_ctor() fail

Signed-off-by: Kirill A. Shutemov <[e-mail]>
Cc: Paul Mundt <[e-mail]>
Signed-off-by: Andrew Morton <[e-mail]>
Signed-off-by: Linus Torvalds <[e-mail]>

arch/sh/include/asm/pgalloc.h

···
 	if (!pg)
 		return NULL;
 	page = virt_to_page(pg);
-	pgtable_page_ctor(page);
+	if (!pgtable_page_ctor(page)) {
+		quicklist_free(QUICK_PT, NULL, pg);
+		return NULL;
+	}
 	return page;
 }