staging:rtl8192u: Refactor RT_TRACE - Style

Refactor the MACRO RT_TRACE to add parentheses around the parameter
'component', this clears the checkpatch warning with respect to
precedence issues.

This is a coding style change which should have no impact on runtime
code execution.

Signed-off-by: John Whitmore <johnfwhitmore@gmail.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>