staging:rtl8192u: Fix space characters - Style

Fix the spacing issues, remove space after cast operation, and replace
spaces at start of line with tab.

These changes are purely coding style changes to resolve checkpatch
issues. There should be no impact on runtime code execution.

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