staging: rtl8192u: Adjust 'if' to follow Kernel coding Style

-Adjust spaces around if and the condition expression to
maintain Linux Kernel Coding style.
-Remove unnecessary braces around if-else as only single statement is executed.

Signed-off-by: Bhanusree Pola <bhanusreemahesh@gmail.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>