Fix compiler warnings:

gcc 4.7.2

client/X11/xf_keyboard.c: In function ‘xf_keyboard_action_script_init’:
client/X11/xf_keyboard.c:48:6: warning: unused variable ‘exitCode’
[-Wunused-variable]

gcc 4.9

client/X11/xf_client.c: In function ‘xf_client_thread’:
client/X11/xf_client.c:1537:3: warning: ‘inputThread’ may be used
uninitialized in this function [-Wmaybe-uninitialized]

client/X11/xf_client.c

@@ -1427,8 +1427,8 @@ void* xf_client_thread(void* param)
 	xfContext* xfc;
 	freerdp* instance;
 	rdpContext* context;
-	HANDLE inputEvent;
-	HANDLE inputThread;
+	HANDLE inputEvent = NULL;
+	HANDLE inputThread = NULL;
 	rdpChannels* channels;
 	rdpSettings* settings;
 

client/X11/xf_keyboard.c

@@ -45,7 +45,6 @@
 
 BOOL xf_keyboard_action_script_init(xfContext* xfc)
 {
-	int exitCode;
 	FILE* keyScript;
 	char* keyCombination;
 	char buffer[1024] = { 0 };