staging: rtlwifi: Remove nonessential semicolon

Remove non-essential semicolon after 'else' and 'switch' statements. Issue
found using semicolon.cocci Coccinelle script.

Signed-off-by: Arushi Singhal <arushisinghal19971997@gmail.com>
Acked-by: Julia Lawall <julia.lawall@lip6.fr>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>