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devusb: check for nil hp->dump and hp->seprintep

--- a/sys/src/9/port/devusb.c

+++ b/sys/src/9/port/devusb.c

@@ -421,8 +421,10 @@

 			s = seprint(s, e, "ep%d.%d ", ep->dev->nb, ep->nb);

 			seprintep(s, e, ep, 1);

 			print("%s", buf);

-			ep->hp->seprintep(buf, e, ep);

-			print("%s", buf);

+			if(ep->hp->seprintep != nil){

+				ep->hp->seprintep(buf, e, ep);

+				print("%s", buf);

+			}

 			poperror();

 			putep(ep);

 		}

@@ -429,7 +431,7 @@

 	}

 	print("usb dump hcis:\n");

 	for(i = 0; i < Nhcis; i++)

-		if(hcis[i] != nil)

+		if(hcis[i] != nil && hcis[i]->dump != nil)

 			hcis[i]->dump(hcis[i]);

 }