staging: usbip: userspace: libsrc: fix indention

This patch fixes the following checkpatch warning:
-ERROR: code indent should use tabs where possible
-WARNING: suspect code indent for conditional statements
Signed-off-by: Kurt Kanzenbach <ly80toro@cip.cs.fau.de>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>