Fix kcm mouse module crash

This resolves Bug 1688

kcontrol/input/logitechmouse.cpp

@@ -115,8 +115,10 @@ LogitechMouse::LogitechMouse( struct usb_device *usbDev, int mouseCapabilityFlag
 
 LogitechMouse::~LogitechMouse()
 {
+    if (m_usbDeviceHandle != 0) {
         usb_close( m_usbDeviceHandle );
     }
+}
 
 void LogitechMouse::initCordlessStatusReporting()
 {