hexagon: handle pgtable_page_ctor() fail

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

arch/hexagon/include/asm/pgalloc.h

···
 	struct page *pte;
 
 	pte = alloc_page(GFP_KERNEL | __GFP_REPEAT | __GFP_ZERO);
-
-	if (pte)
-		pgtable_page_ctor(pte);
-
+	if (!pte)
+		return NULL;
+	if (!pgtable_page_ctor(pte)) {
+		__free_page(pte);
+		return NULL;
+	}
 	return pte;
 }