Fix warning when closing while connected

SerialGamepad/Info.plist

@@ -21,7 +21,7 @@
 	<key>CFBundleSignature</key>
 	<string>????</string>
 	<key>CFBundleVersion</key>
-	<string>98</string>
+	<string>100</string>
 	<key>LSApplicationCategoryType</key>
 	<string>public.app-category.utilities</string>
 	<key>LSMinimumSystemVersion</key>

SerialGamepad/MainWindow.m

@@ -29,13 +29,13 @@
 
 - (BOOL)windowShouldClose:(id)sender {
     if (serialThread != nil) {
-        [fooHID close];
-        
         // Stop thread and wait for it to finish
         [serialThread setRunning:NO];
         while ([serialThread isFinished] == NO) {
             usleep(1000);
         }
+        serialThread = nil;
+        [fooHID close];
     }
     
     return YES;