staging: rtl8712: r8712_init_recvbuf(): Change return type

Change return type of r8712_init_recvbuf from int to void as it always
returned _SUCCESS and this return value was never used at any call site.

Signed-off-by: Nishka Dasgupta <nishkadg.linux@gmail.com>
Link: https://lore.kernel.org/r/20190722092341.21030-7-nishkadg.linux@gmail.com


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