perf hists browser: Fix possible memory leak

The options array saves strings for each popup menu item.  The number of
items can be vary according to the currently selected item.  So it can
leak some memory if it's exited from a small item.  Fix it by freeing
all items when loop terminates.
Signed-off-by: Namhyung Kim <namhyung@kernel.org>
Acked-by: Jiri Olsa <jolsa@kernel.org>
Cc: David Ahern <dsahern@gmail.com>
Cc: Peter Zijlstra <a.p.zijlstra@chello.nl>
Link: http://lkml.kernel.org/r/1429687101-4360-4-git-send-email-namhyung@kernel.orgSigned-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>

tools/perf/ui/browsers/hists.c

@@ -1424,7 +1424,8 @@ static int perf_evsel__hists_browse(struct perf_evsel *evsel, int nr_events,
 	struct hist_browser *browser = hist_browser__new(hists);
 	struct branch_info *bi;
 	struct pstack *fstack;
-	char *options[16];
+#define MAX_OPTIONS  16
+	char *options[MAX_OPTIONS];
 	int nr_options = 0;
 	int key = -1;
 	char buf[64];
@@ -1691,7 +1692,8 @@ static int perf_evsel__hists_browse(struct perf_evsel *evsel, int nr_events,
 				"Switch to another data file in PWD") > 0)
 			switch_data = nr_options++;
 add_exit_option:
-		options[nr_options++] = (char *)"Exit";
+		if (asprintf(&options[nr_options], "Exit") > 0)
+			nr_options++;
 retry_popup_menu:
 		choice = ui__popup_menu(nr_options, options);
 
@@ -1812,7 +1814,7 @@ static int perf_evsel__hists_browse(struct perf_evsel *evsel, int nr_events,
 	pstack__delete(fstack);
 out:
 	hist_browser__delete(browser);
-	free_popup_options(options, nr_options - 1);
+	free_popup_options(options, MAX_OPTIONS);
 	return key;
 }