perf c2c report: Call calc_width() only for displayed entries

There's no need to calculate column widths for entries that are not
going to be displayed.

Signed-off-by: Jiri Olsa <jolsa@kernel.org>
Cc: Alexander Shishkin <alexander.shishkin@linux.intel.com>
Cc: David Ahern <dsahern@gmail.com>
Cc: Joe Mario <jmario@redhat.com>
Cc: Namhyung Kim <namhyung@kernel.org>
Cc: Peter Zijlstra <peterz@infradead.org>
Link: http://lkml.kernel.org/r/20180309101442.9224-7-jolsa@kernel.org
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>

tools/perf/builtin-c2c.c

@@ -1873,12 +1873,11 @@ static int resort_cl_cb(struct hist_entry *he)
 	c2c_he = container_of(he, struct c2c_hist_entry, he);
 	c2c_hists = c2c_he->hists;
 
-	calc_width(c2c_he);
-
 	if (display && c2c_hists) {
 		static unsigned int idx;
 
 		c2c_he->cacheline_idx = idx++;
+		calc_width(c2c_he);
 
 		c2c_hists__reinit(c2c_hists, c2c.cl_output, c2c.cl_resort);