Clean up a bunch of if statements based on govet results

security/dns.go

@@ -52,7 +52,7 @@ func dnsMacOS() []string {
 
 	if len(lines) > 0 {
 		return lines
-	} else {
-		return []string{}
 	}
+
+	return []string{}
 }

security/wifi.go

@@ -83,9 +83,9 @@ func wifiNameMacOS() string {
 func matchStr(data [][]string) string {
 	if len(data) <= 1 {
 		return ""
-	} else {
-		return data[1][1]
 	}
+
+	return data[1][1]
 }
 
 //Windows