Name the var what it really is and detect potential issue

We were assigning the var, before the type was compared which
could result in accepting "audio" stream for "video" JitsiLocalTrack.

modules/RTC/JitsiLocalTrack.js

@@ -1,4 +1,5 @@
-/* global Promise */
+/* global __filename, Promise */
+var logger = require("jitsi-meet-logger").getLogger(__filename);
 var JitsiTrack = require("./JitsiTrack");
 var RTCBrowserType = require("./RTCBrowserType");
 var JitsiTrackEvents = require('../../JitsiTrackEvents');
@@ -137,6 +138,9 @@ JitsiLocalTrack.prototype._setMute = function (mute, resolve, reject) {
             //FIXME: Maybe here we should set the SRC for the containers to something
         } else {
             var self = this;
+            // FIXME why are we doing all this audio type checks and
+            // convoluted scenarios if we're going this way only
+            // for VIDEO media and CAMERA type of video ?
             var streamOptions = {
                 devices: (isAudio ? ["audio"] : ["video"]),
                 resolution: self.resolution
@@ -147,18 +151,25 @@ JitsiLocalTrack.prototype._setMute = function (mute, resolve, reject) {
                 streamOptions['cameraDeviceId'] = self.deviceId;
             }
             RTCUtils.obtainAudioAndVideoPermissions(streamOptions)
-                .then(function (streams) {
-                    var stream = null;
-                    for(var i = 0; i < streams.length; i++) {
-                        stream = streams[i];
-                        if(stream.type === self.type) {
-                            self.stream = stream.stream;
-                            self.videoType = stream.videoType;
+                .then(function (streamsInfo) {
+                    var streamInfo = null;
+                    for(var i = 0; i < streamsInfo.length; i++) {
+                        if(streamsInfo[i].type === self.type) {
+                            streamInfo = streamsInfo[i];
+                            self.stream = streamInfo.stream;
+                            // This is not good when video type changes after
+                            // unmute, but let's not crash here
+                            if (self.videoType != streamInfo.videoType) {
+                                logger.error(
+                                    "Video type has changed after unmute!",
+                                    self.videoType, streamInfo.videoType);
+                                self.videoType = streamInfo.videoType;
+                            }
                             break;
                         }
                     }
 
-                    if(!stream) {
+                    if(!streamInfo) {
                         reject(new Error('track.no_stream_found'));
                         return;
                     }