staging: r8712u: Merging Realtek's latest (v2.6.6). Redundant NULL check.

Removed the redundant NULL check in LedControl871x.
As noted by Dan Carpenter, the address of a stack variable is never NULL.

Signed-off-by: Ali Bahar <ali@internetDog.org>
Signed-off-by: Larry Finger <Larry.Finger@lwfinger.net>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>