staging: rtl8712: r8712_construct_txaggr_cmd_desc(): Change return type

Change return type of r8712_construct_txaggr_cmd_desc from u8 to void
(and remove its return statement) as it always returns _SUCCESS and its
return value is never stored, checked or otherwise used.

Signed-off-by: Nishka Dasgupta <nishkadg.linux@gmail.com>
Link: https://lore.kernel.org/r/20190809052353.5308-7-nishkadg.linux@gmail.com


Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>