score: handle pgtable_page_ctor() fail

Signed-off-by: Kirill A. Shutemov <[e-mail]>
Cc: Chen Liqin <[e-mail]>
Acked-by: Lennox Wu <[e-mail]>
Signed-off-by: Andrew Morton <[e-mail]>
Signed-off-by: Linus Torvalds <[e-mail]>

arch/score/include/asm/pgalloc.h

···
 	struct page *pte;
 
 	pte = alloc_pages(GFP_KERNEL | __GFP_REPEAT, PTE_ORDER);
-	if (pte) {
-		clear_highpage(pte);
-		pgtable_page_ctor(pte);
+	if (!pte)
+		return NULL;
+	clear_highpage(pte);
+	if (!pgtable_page_ctor(pte)) {
+		__free_page(pte);
+		return NULL;
 	}
 	return pte;
 }