[gtk/tracing] fix a compiler warning

[Matthias Clasen <matthiasc src gnome org>]

commit a2b9fd75d6aba95ac3ca5477b61d45d4c34b8551
Author: Matthias Clasen <mclasen redhat com>
Date:   Thu May 17 20:15:25 2018 +0100

    fix a compiler warning

 gdk/gdkprofiler.c | 1 -
 1 file changed, 1 deletion(-)
---
diff --git a/gdk/gdkprofiler.c b/gdk/gdkprofiler.c
index 825e11f5f7..7847ac4484 100644
--- a/gdk/gdkprofiler.c
+++ b/gdk/gdkprofiler.c
@@ -41,7 +41,6 @@ void
 gdk_profiler_start (void)
 {
   char *filename;
-  SpCaptureCounter counter;
 
   running = TRUE;