[PATCH] tracing: remove unused ret

[Alex Shi <alex.shi@linux.alibaba.com>]

No body care the variable 'ret' in function unregister_field_var_hists,
better to remove it.

Signed-off-by: Alex Shi <alex.shi@linux.alibaba.com>
Cc: Steven Rostedt <rostedt@goodmis.org> 
Cc: Ingo Molnar <mingo@redhat.com> 
Cc: linux-kernel@vger.kernel.org 
---
 kernel/trace/trace_events_hist.c | 3 +--
 1 file changed, 1 insertion(+), 2 deletions(-)

diff --git a/kernel/trace/trace_events_hist.c b/kernel/trace/trace_events_hist.c
index f62de5f43e79..0acfac95ca2a 100644
--- a/kernel/trace/trace_events_hist.c
+++ b/kernel/trace/trace_events_hist.c
@@ -5712,12 +5712,11 @@ static void unregister_field_var_hists(struct hist_trigger_data *hist_data)
 	struct trace_event_file *file;
 	unsigned int i;
 	char *cmd;
-	int ret;
 
 	for (i = 0; i < hist_data->n_field_var_hists; i++) {
 		file = hist_data->field_var_hists[i]->hist_data->event_file;
 		cmd = hist_data->field_var_hists[i]->cmd;
-		ret = event_hist_trigger_func(&trigger_hist_cmd, file,
+		event_hist_trigger_func(&trigger_hist_cmd, file,
 					      "!hist", "hist", cmd);
 	}
 }
-- 
1.8.3.1