perf tools: Make hists__collapse_insert_entry static

No need to export hists__collapse_insert_entry function.
Signed-off-by: Jiri Olsa <jolsa@kernel.org>
Cc: Andi Kleen <ak@linux.intel.com>
Cc: David Ahern <dsahern@gmail.com>
Cc: Namhyung Kim <namhyung@kernel.org>
Cc: Peter Zijlstra <a.p.zijlstra@chello.nl>
Cc: Stephane Eranian <eranian@google.com>
Link: http://lkml.kernel.org/r/1458823940-24583-4-git-send-email-jolsa@kernel.orgSigned-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>

tools/perf/util/hist.c

@@ -1295,7 +1295,8 @@ static int hists__hierarchy_insert_entry(struct hists *hists,
 	return ret;
 }
 
-int hists__collapse_insert_entry(struct hists *hists, struct rb_root *root,
+static int hists__collapse_insert_entry(struct hists *hists,
+					struct rb_root *root,
 					struct hist_entry *he)
 {
 	struct rb_node **p = &root->rb_node;

tools/perf/util/hist.h

@@ -199,8 +199,6 @@ int hists__init(void);
 int __hists__init(struct hists *hists, struct perf_hpp_list *hpp_list);
 
 struct rb_root *hists__get_rotate_entries_in(struct hists *hists);
-int hists__collapse_insert_entry(struct hists *hists,
-				  struct rb_root *root, struct hist_entry *he);
 
 struct perf_hpp {
 	char *buf;