i2400m: drop i2400m_schedule_work()

i2400m implements dynamic work allocation and queueing mechanism in
i2400_schedule_work(); however, this is only used for reset and
recovery which can be served equally well with preallocated per device
works.

Replace i2400m_schedule_work() with two work structs in struct i2400m.
These works are explicitly canceled when the device is released making
calls to flush_scheduled_work(), which is being deprecated,
unnecessary.

Signed-off-by: Tejun Heo <tj@kernel.org>
Cc: "David S. Miller" <davem@davemloft.net>
Cc: Inaky Perez-Gonzalez <inaky.perez-gonzalez@intel.com>
Cc: linux-wimax@intel.com
Cc: netdev@vger.kernel.org

drivers/net/wimax/i2400m/usb.c

@@ -780,7 +780,6 @@ module_init(i2400mu_driver_init);
 static
 void __exit i2400mu_driver_exit(void)
 {
-	flush_scheduled_work();	/* for the stuff we schedule from sysfs.c */
 	usb_deregister(&i2400mu_driver);
 }
 module_exit(i2400mu_driver_exit);