staging/xillybus: Handle OOM in xillybus_init()
staging/xillybus: Handle OOM in xillybus_init()

alloc_workqueue() can fail and returns NULL in case of
OOM.
Handle this case and undo class_create().

Signed-off-by: Richard Weinberger <320bca71fc381a4a025636043ca86e734e31cf8b@nod.at>
Signed-off-by: Greg Kroah-Hartman <4645f7897fd33786a2ee1264d590b3c400559d85@linuxfoundation.org>

KristFoundation/Programs,KristFoundation/Programs,KristFoundation/Programs,KristFoundation/Programs,KristFoundation/Programs,KristFoundation/Programs