perf hists browser: Skip scripting when perf.data file not available

The script and data-switch context menu are only meaningful when it
deals with a data file.  So add a check so that it cannot be shown when
perf-top is run.

Signed-off-by: Namhyung Kim <namhyung@kernel.org>
Tested-by: Arnaldo Carvalho de Melo <acme@redhat.com>
Cc: Andi Kleen <andi@firstfloor.org>
Cc: David Ahern <dsahern@gmail.com>
Cc: Jiri Olsa <jolsa@kernel.org>,
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Stephane Eranian <eranian@google.com>
Cc: Wang Nan <wangnan0@huawei.com>
Link: http://lkml.kernel.org/r/1453555902-18401-4-git-send-email-namhyung@kernel.org
[ Use goto skip_scripting instead of two is_report_browser() tests ]
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>

tools/perf/ui/browsers/hists.c

@@ -2303,6 +2303,9 @@ static int perf_evsel__hists_browse(struct perf_evsel *evsel, int nr_events,
 					     &options[nr_options],
 					     socked_id);
 		/* perf script support */
+		if (!is_report_browser(hbt))
+			goto skip_scripting;
+
 		if (browser->he_selection) {
 			if (sort__has_thread && thread) {
 				nr_options += add_script_opt(browser,
@@ -2330,6 +2333,7 @@ static int perf_evsel__hists_browse(struct perf_evsel *evsel, int nr_events,
 					     &options[nr_options], NULL, NULL);
 		nr_options += add_switch_opt(browser, &actions[nr_options],
 					     &options[nr_options]);
+skip_scripting:
 		nr_options += add_exit_opt(browser, &actions[nr_options],
 					   &options[nr_options]);