usb: usbtmc: Fix disconnect/poll interaction
When the device is disconnected poll waiters were not being woken.
Changes for v2:
- add commit summary
- add Fixes and Reported-by tags
Fixes: eb6b92ecc0f9 ("Add support for receiving USBTMC USB488 SRQ notifications via poll/select")
Reported-by: Oliver Neukum <oneukum@suse.com>
Signed-off-by: Dave Penkler <dpenkler@gmail.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
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