perf diff: Remove displacement from struct hist_entry_diff

Removing displacement from struct hist_entry_diff, because it's not
used. Displacement is not used for sorting, so there's no reason to
pre-calculate it.

Signed-off-by: Jiri Olsa <jolsa@redhat.com>
Acked-by: Namhyung Kim <namhyung@kernel.org>
Cc: Corey Ashford <cjashfor@linux.vnet.ibm.com>
Cc: Frederic Weisbecker <fweisbec@gmail.com>
Cc: Ingo Molnar <mingo@elte.hu>
Cc: Namhyung Kim <namhyung@kernel.org>
Cc: Paul Mackerras <paulus@samba.org>
Cc: Peter Zijlstra <a.p.zijlstra@chello.nl>
Link: http://lkml.kernel.org/r/1354110769-2998-5-git-send-email-jolsa@redhat.com
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>

tools/perf/util/sort.h

@@ -55,9 +55,6 @@ struct he_stat {
 struct hist_entry_diff {
 	bool	computed;
 
-	/* PERF_HPP__DISPL */
-	int	displacement;
-
 	/* PERF_HPP__DELTA */
 	double	period_ratio_delta;