staging: rtl8192u: Removing true and false comparison

Remove comparison to true and false in if statement.
Problem found usingcheckpatch.pl.
CHECK: Using comparison to true is error prone
CHECK: Using comparison to false is error prone

Signed-off-by: simran singhal <singhalsimran0@gmail.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>