staging: rtl8723bs: hal: Remove return type of initrecvbuf

change return of initrecvbuf from s32 to void. As this function always
returns SUCCESS .

Signed-off-by: Hariprasad Kelam <hariprasad.kelam@gmail.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>