staging: r8188eu: remove spaces before tabs

Delete spaces before tabs in the comments. Issue found with checkpatch.
WARNING: please, no space before tabs
Signed-off-by: Jaehee Park <jhpark1013@gmail.com>
Link: https://lore.kernel.org/r/1b1e8cda03ca5d3fdf26c511da76258f7a2ab8d5.1650568579.git.jhpark1013@gmail.comSigned-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>