staging: rtl8712: r8712_setMacAddr_cmd(): Change return type

Change return type of function r8712_setMacAddr_cmd() to void as its
return value is never stored, checked, or otherwise used. Modify its
return statements accordingly.

Signed-off-by: Nishka Dasgupta <nishkadg.linux@gmail.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>