Accept some golint suggestions (#690)

* Fixed some linter issues

* Simplified isBetter method

* Accept some linter suggestions

* Fix typo

Co-authored-by: klesomik <klesomiks@gmail.com>
Co-authored-by: Neil Alexander <neilalexander@users.noreply.github.com>

src/tuntap/iface.go

@@ -199,7 +199,6 @@ func (tun *TunAdapter) _handlePacket(recvd []byte, err error) {
 						tc.writeFrom(nil, packet)
 					}
 				})
-				return
 			}()
 		}
 	}