Staging: otus: Remove mix of tabs and spaces with just tabs in ioctl.c

Previously defines had a mix of both tabs and spaces, causing an error
in the checkpatch tool.  These tabs and spaces have been consolidated to
only tabs.

Signed-off-by: Steven Harms <sharms@ubuntu.com>
Acked-by: Simon Horman <horms@verge.net.au>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>