Staging: rtl8192u: Bool tests don't need comparisons

This patch removes explicit true/false comparations to bool variables.
Warning found by coccinelle:
"WARNING: Comparison to bool"

Signed-off-by: Cristina Opriceana <cristina.opriceana@gmail.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>