niu: BUG on inability to find page in rx page hashes.

Signed-off-by: David S. Miller <davem@davemloft.net>
diff --git a/drivers/net/niu.c b/drivers/net/niu.c
index 3d523cb..b9b9508 100644
--- a/drivers/net/niu.c
+++ b/drivers/net/niu.c
@@ -3330,10 +3330,12 @@
 	for (; (p = *pp) != NULL; pp = (struct page **) &p->mapping) {
 		if (p->index == addr) {
 			*link = pp;
-			break;
+			goto found;
 		}
 	}
+	BUG();
 
+found:
 	return p;
 }