perf report: Make dso__calc_col_width agree with hist_entry__dso_snprintf

The first was always using the ->long_name, while the later used
->short_name if verbose was not set, resulting in the dso column to be
much wider than needed most of the time.

Cc: Frédéric Weisbecker <fweisbec@gmail.com>
Cc: Mike Galbraith <efault@gmx.de>
Cc: Paul Mackerras <paulus@samba.org>
Cc: Peter Zijlstra <a.p.zijlstra@chello.nl>
Cc: Tom Zanussi <tzanussi@gmail.com>
LKML-Reference: <new-submission>
Signed-off-by: NArnaldo Carvalho de Melo <acme@redhat.com>

tools/perf/util/event.c

@@ -626,8 +626,10 @@ static void dso__calc_col_width(struct dso *self)
 	if (!symbol_conf.col_width_list_str && !symbol_conf.field_sep &&
 	    (!symbol_conf.dso_list ||
 	     strlist__has_entry(symbol_conf.dso_list, self->name))) {
-		unsigned int slen = strlen(self->name);
-		if (slen > dsos__col_width)
+		u16 slen = self->short_name_len;
+		if (verbose)
+			slen = self->long_name_len;
+		if (dsos__col_width < slen)
 			dsos__col_width = slen;
 	}