to be updated with newly plugged in devices without the need to recreate a
BJoystick object.
* Do an initial (re-)scan on object creation instead of always scanning in
CountDevices() and by extension GetDeviceName().
* This makes CountDevices() and GetDeviceName() stable with regards to the
device list, so that an enumerating application doesn't suddenly get more/less
devices than it might expect.
git-svn-id: file:///srv/svn/repos/haiku/haiku/trunk@41870 a95241bf-73f2-0310-859d-f6bbb57e9c96