staging: r8188eu: code indent should use tabs

Replace spaces with tab to clear the following checkpatch issues.

usb_intf.c:38: ERROR: code indent should use tabs where possible
usb_intf.c:38: WARNING: please, no spaces at the start of a line

Signed-off-by: Michael Straube <straube.linux@gmail.com>
Link: https://lore.kernel.org/r/20211117072007.19924-1-straube.linux@gmail.com


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