Staging: quatech_usb2: fix coding style issues

This is a patch to the file quatech_usb2.c that fixes two space before
tabular and one line of more than 80 characters warnings found by
checkpatch.pl

Signed-off-by: Soeren Moeller <soerenmoeller2001@gmail.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>