staging: rtl8188eu: Fix couple of typos

s/pasive/passive/
s/varable/variable/

Acked-by: Randy Dunlap <rdunlap@infradead.org>
Signed-off-by: Bhaskar Chowdhury <unixbhaskar@gmail.com>
Link: https://lore.kernel.org/r/20210319193414.10393-1-unixbhaskar@gmail.com


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