USB: cyberjack: clean up write-urb busy handling
USB: cyberjack: clean up write-urb busy handling

Use port write_urbs_free mask rather than write_urb_busy field in struct
serial_port.

Compile-only tested.

Cc: Matthias Bruestle and Harald Welte <5bdcd3c0d4d24ae3e71b3b452a024c6324c7e4bb@reiner-sct.com>
Signed-off-by: Johan Hovold <6a430eed381e126d51a8cce8db662f765ce314bc@gmail.com>
Signed-off-by: Greg Kroah-Hartman <4645f7897fd33786a2ee1264d590b3c400559d85@suse.de>

TeamVee-Kanas/android_kernel_samsung_kanas,KristFoundation/Programs,KristFoundation/Programs,KristFoundation/Programs,KristFoundation/Programs,TeamVee-Kanas/android_kernel_samsung_kanas,TeamVee-Kanas/android_kernel_samsung_kanas,KristFoundation/Programs,TeamVee-Kanas/android_kernel_samsung_kanas,TeamVee-Kanas/android_kernel_samsung_kanas,KristFoundation/Programs