rt-tests: cyclictest avoid unneeded warning

Avoid annoying warning message when tracing is not requested and the debug
file system is not available.

The same test already protects against calling event_enable_all().

Signed-off-by: Frank Rowand <frank.rowand@am.sony.com>
Reviewed-by: Darren Hart <dvhart@linux.intel.com>
Signed-off-by: Clark Williams <williams@redhat.com>

src/cyclictest/cyclictest.c

@@ -1611,8 +1611,9 @@ int main(int argc, char **argv)
 	if (trace_fd >= 0)
 		close(trace_fd);
 
-	/* turn off all events */
-	event_disable_all();
+	if (enable_events)
+		/* turn off all events */
+		event_disable_all();
 
 	/* turn off the function tracer */
 	fileprefix = procfileprefix;