perf hists: Move column length calculation out of hists__inc_stats()

It's not the part of logic of hists__inc_stats() so it'd be better to
move it out of the function.

Signed-off-by: Namhyung Kim <namhyung@kernel.org>
Link: http://lkml.kernel.org/r/1398327843-31845-4-git-send-email-namhyung@kernel.org
Signed-off-by: Jiri Olsa <jolsa@kernel.org>
diff --git a/tools/perf/builtin-diff.c b/tools/perf/builtin-diff.c
index 0e46fa1..c9cc771 100644
--- a/tools/perf/builtin-diff.c
+++ b/tools/perf/builtin-diff.c
@@ -587,6 +587,9 @@
 
 		insert_hist_entry_by_compute(&hists->entries, he, compute);
 		hists__inc_stats(hists, he);
+
+		if (!he->filtered)
+			hists__calc_col_len(hists, he);
 	}
 }