Initialize ffd to -1 in the constructor otherwise many checks may fail

afterwards, and BJoystick won't work.
Also reset it to -1 in the destructor for symmetry.
Found by Carwyn Jones. Thanks!


git-svn-id: file:///srv/svn/repos/haiku/haiku/trunk@40900 a95241bf-73f2-0310-859d-f6bbb57e9c96

src/kits/device/Joystick.cpp

@@ -49,6 +49,7 @@ LOG(const char *fmt, ...)
 BJoystick::BJoystick()
 	:
 	fBeBoxMode(false),
+	ffd(-1),
 	fDevices(new BList),
 	fJoystickInfo(new _joystick_info())
 {
@@ -61,8 +62,10 @@ BJoystick::BJoystick()
 
 BJoystick::~BJoystick()
 {
-	if (ffd >= 0)
+	if (ffd >= 0) {
 		close(ffd);
+		ffd = -1;	
+	}
 
 	for (int32 count = fDevices->CountItems() - 1; count >= 0; count--) {
 		free(fDevices->RemoveItem(count));
@@ -132,17 +135,18 @@ void
 BJoystick::Close(void)
 {
 	CALLED();
-	if (ffd >= 0)
+	if (ffd >= 0) {
 		close(ffd);
-	ffd = -1;
+		ffd = -1;
+	}
 }
 
 
 void
-BJoystick::ScanDevices(bool use_disabled)
+BJoystick::ScanDevices(bool useDisabled)
 {
 	CALLED();
-	if (use_disabled) {
+	if (useDisabled) {
 		_BJoystickTweaker temp(*this);
 		temp.scan_including_disabled();
 	}
@@ -228,6 +232,7 @@ BJoystick::CountButtons()
 	return fJoystickInfo->num_buttons;
 }
 
+
 status_t
 BJoystick::GetControllerModule(BString *out_name)
 {