Fix getNetworkInterfaces response returning a non-array

when only one network inteface is returned.
The returned object is now the Array of network interfaces (as declared in the JSDoc) instead of an object containing the array.

lib/device.js

@@ -186,7 +186,7 @@ module.exports = function(Cam) {
 	/**
 	 * @callback Cam~GetNetworkInterfacesCallback
 	 * @property {?Error} error
-	 * @property {Array.<Cam~NetworkInterface>} network interfaces information
+	 * @property {Array.<Cam~NetworkInterface>} networkInterfaces Network interfaces information
 	 * @property {string} xml Raw SOAP response
 	 */
 
@@ -202,7 +202,10 @@ module.exports = function(Cam) {
 			this._envelopeFooter()
 		}, function(err, data, xml) {
 			if (!err) {
-				this.networkInterfaces = linerase(data).getNetworkInterfacesResponse;
+				this.networkInterfaces = linerase(data).getNetworkInterfacesResponse.networkInterfaces;
+				// networkInterfaces is an array of network interfaces, but linerase remove the array if there is only one element inside
+				// so we convert it back to an array
+				if (!Array.isArray(this.networkInterfaces)) {this.networkInterfaces = [this.networkInterfaces];}
 			}
 			if (callback) {
 				callback.call(this, err, this.networkInterfaces, xml);