staging: r8188eu: replace spaces with tabs

Use tabs instead of spaces. Issue found with checkpatch.
WARNING: suspect code indent for conditional statements

Signed-off-by: Jaehee Park <jhpark1013@gmail.com>
Link: https://lore.kernel.org/r/fd4a66013be081bc5adb491c6dc7774362d1ac82.1650568579.git.jhpark1013@gmail.com


Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>