staging: rtl8187se: Fix "code indent should use tabs where possible" error

Fix checkpatch.pl error:
ERROR: code indent should use tabs where possible

Also fix some problems with tabs in an if-statement.
Signed-off-by: Ana Rey <anarey@gmail.com>
Signed-off-by: Peter P Waskiewicz Jr <peter.p.waskiewicz.jr@intel.com>