gstlal_cherenkov_burst: put buf_seg argument in different location

gstlal-burst/bin/gstlal_cherenkov_burst

@@ -198,12 +198,12 @@ class PipelineHandler(simplehandler.Handler):
 			# extract segment. move the segment's upper
 			# boundary to include all triggers.
 			buf_timestamp = lal.LIGOTimeGPS(0, buf.pts)
+			buf_seg = segments.segment(buf_timestamp, max(buf_timestamp + lal.LIGOTimeGPS(0, buf.duration), max(event.peak for event in events) if events else 0.0))
 			if buf.mini_object.flags & Gst.BufferFlags.GAP:
 				# sanity check that gap buffers are empty
 				assert not events
 			else:
 				# update trigger rate and livetime
-				buf_seg = segments.segment(buf_timestamp, max(buf_timestamp + lal.LIGOTimeGPS(0, buf.duration), max(event.peak for event in events) if events else 0.0))
 				self.rankingstat.denominator.triggerrates[instrument].add_ratebin(tuple(map(float, buf_seg)), len(events))
 
 			# push the single detector trigger into the