perf record: Don't call newt functions when not initialized

When processing events we want to give visual feedback to the user when
using the newt browser, so there are ui_progress calls in
__perf_session__process_events, but those should check if newt is being
used.

Reported-by: Srikar Dronamraju <[e-mail]>
Tested-by: Srikar Dronamraju <[e-mail]>
Cc: Ananth N Mavinakayanahalli <[e-mail]>
Cc: Frédéric Weisbecker <[e-mail]>
Cc: Ingo Molnar <[e-mail]>
Cc: Masami Hiramatsu <[e-mail]>,
Cc: Peter Zijlstra <[e-mail]>
Cc: Srikar Dronamraju <[e-mail]>
Cc: Stephane Eranian <[e-mail]>
Cc: Tom Zanussi <[e-mail]>
LKML-Reference: <[e-mail]>
Signed-off-by: Arnaldo Carvalho de Melo <[e-mail]>

tools/perf/util/newt.c

···
 
 	if (self != NULL) {
 		int cols;
+
+		if (use_browser <= 0)	
+			return self;
 		newtGetScreenSize(&cols, NULL);
 		cols -= 4;
 		newtCenteredWindow(cols, 1, title);
···
 
 void ui_progress__update(struct ui_progress *self, u64 curr)
 {
+	/*
+	 * FIXME: We should have a per UI backend way of showing progress,
+	 * stdio will just show a percentage as NN%, etc.
+	 */
+	if (use_browser <= 0)
+		return;
 	newtScaleSet(self->scale, curr);
 	newtRefresh();
 }
 
 void ui_progress__delete(struct ui_progress *self)
 {
-	newtFormDestroy(self->form);
-	newtPopWindow();
+	if (use_browser > 0) {
+		newtFormDestroy(self->form);
+		newtPopWindow();
+	}
 	free(self);
 }