Improve error handling during MTP startup

Change-Id: I9395481dd8d9cbd3346fe6682557236b48b4d6cd
diff --git a/mtp/mtp_MtpServer.hpp b/mtp/mtp_MtpServer.hpp
index 360d1c3..ce6b13c 100755
--- a/mtp/mtp_MtpServer.hpp
+++ b/mtp/mtp_MtpServer.hpp
@@ -43,7 +43,7 @@
 class twmtp_MtpServer {
 	public:
 		void start();
-		void setup();
+		int setup();
 		void run();
 		void cleanup();
 		void send_object_added(int handle);