p2p/netutil: minor code cosmetic

Signed-off-by: Abirdcfly <fp544037857@gmail.com>

p2p/netutil/error_test.go

@@ -66,7 +66,6 @@ func TestIsPacketTooBig(t *testing.T) {
 		for i := range buf {
 			if buf[i] != byte(i) {
 				t.Fatalf("error in pattern")
-				break
 			}
 		}
 	}