mei: bus: Reset event_cb when disabling a device
After cancelling all reads from the disable hook, we need to reset the event_cb pointer as well or else we won't be able to set a new one up when re-enabling the device. Acked-by: NTomas Winkler <tomas.winkler@intel.com> Signed-off-by: NSamuel Ortiz <sameo@linux.intel.com> Signed-off-by: NGreg Kroah-Hartman <gregkh@linuxfoundation.org>
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