Bring code into line with Golangci-lint linters

- Error strings are no longer capitalized nor end with punctuation
- Alias import
- Remove extraneous initilisation code (No need to provide zero value
	for variables, because the compiler does that anyway)

client/lib/peers.go

@@ -44,13 +44,13 @@ func (p *Peers) Collect() (Snowflake, error) {
 	cnt := p.Count()
 	s := fmt.Sprintf("Currently at [%d/%d]", cnt, p.capacity)
 	if cnt >= p.capacity {
-		s := fmt.Sprintf("At capacity [%d/%d]", cnt, p.capacity)
+		s = fmt.Sprintf("At capacity [%d/%d]", cnt, p.capacity)
 		return nil, errors.New(s)
 	}
 	log.Println("WebRTC: Collecting a new Snowflake.", s)
 	// Engage the Snowflake Catching interface, which must be available.
 	if nil == p.Tongue {
-		return nil, errors.New("Missing Tongue to catch Snowflakes with.")
+		return nil, errors.New("missing Tongue to catch Snowflakes with")
 	}
 	// BUG: some broker conflict here.
 	connection, err := p.Tongue.Catch()

client/lib/rendezvous.go

@@ -144,7 +144,7 @@ func NewWebRTCDialer(
 // Initialize a WebRTC Connection by signaling through the broker.
 func (w WebRTCDialer) Catch() (Snowflake, error) {
 	if nil == w.BrokerChannel {
-		return nil, errors.New("Cannot Dial WebRTC without a BrokerChannel.")
+		return nil, errors.New("cannot Dial WebRTC without a BrokerChannel")
 	}
 	// TODO: [#3] Fetch ICE server information from Broker.
 	// TODO: [#18] Consider TURN servers here too.

client/lib/webrtc.go

@@ -309,7 +309,7 @@ func (c *WebRTCPeer) exchangeSDP() error {
 	}
 	// Keep trying the same offer until a valid answer arrives.
 	var ok bool
-	var answer *webrtc.SessionDescription = nil
+	var answer *webrtc.SessionDescription
 	for nil == answer {
 		go c.sendOfferToBroker()
 		answer, ok = <-c.answerChannel // Blocks...