perf hists browser: Elide DSO column when it is set to just one DSO, ditto for threads

And also no leed to show the [.] (level: k, . for userspace) when
showing just one DSO.

Cc: David Ahern <dsahern@gmail.com>
Cc: Frederic Weisbecker <fweisbec@gmail.com>
Cc: Mike Galbraith <efault@gmx.de>
Cc: Paul Mackerras <paulus@samba.org>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Stephane Eranian <eranian@google.com>
Link: http://lkml.kernel.org/n/tip-4h3f6ro5o7ebepjbssxf0dd3@git.kernel.org
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
diff --git a/tools/perf/util/sort.c b/tools/perf/util/sort.c
index 1ee8f1e..16da30d 100644
--- a/tools/perf/util/sort.c
+++ b/tools/perf/util/sort.c
@@ -177,7 +177,9 @@
 				       BITS_PER_LONG / 4, self->ip, o);
 	}
 
-	ret += repsep_snprintf(bf + ret, size - ret, "[%c] ", self->level);
+	if (!sort_dso.elide)
+		ret += repsep_snprintf(bf + ret, size - ret, "[%c] ", self->level);
+
 	if (self->ms.sym)
 		ret += repsep_snprintf(bf + ret, size - ret, "%s",
 				       self->ms.sym->name);