staging: rtl8192e: fix typo in a comment

This patch fixes a checkpatch warning by deleting a repeated word.

Signed-off-by: William Durand <will+git@drnd.me>
Link: https://lore.kernel.org/r/20210213090112.24616-1-will+git@drnd.me


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