staging: rtl8723bs: remove redundant assignment to variable ret

staging: rtl8723bs: remove redundant assignment to variable ret

The variable ret is being assigned an error return value that is never
read, the control passes to a return statement and ret is never referenced.
Remove the redundant assignment. Also remove an empty line.

Addresses-Coverity: ("Unused value")
Signed-off-by: Colin Ian King <colin.king@canonical.com>
Link: https://lore.kernel.org/r/20200729100525.573500-1-colin.king@canonical.com
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>