This one-liner fixes a test for interfaces that are already resumed.

It would be nice if this could get into 2.6.12, but it's not critical
since it only affects people doing selective (runtime) suspend/resume.
Signed-off-by: NAlan Stern <stern@rowland.harvard.edu>
Signed-off-by: NGreg Kroah-Hartman <gregkh@suse.de>