Remove unused variables

Signed-off-by: Daniel Lezcano <daniel.lezcano@linaro.org>
diff --git a/powerdebug.c b/powerdebug.c
index 5109c90..5ff675d 100644
--- a/powerdebug.c
+++ b/powerdebug.c
@@ -192,9 +192,6 @@
 int mainloop(struct powerdebug_options *options)
 {
 	bool enter_hit = false;
-	char clkname_str[64];
-
-	strcpy(clkname_str, "");
 
 	while (1) {
 		int key = 0;