Silence a compilation warning (#425) (#427)

Since setting the receive timeout takes the time_buffer as an argument
this raises a "may be used uninitialized" warning. Setting this to 0
explicitly should prevent that.

(cherry picked from commit 181902d)

Co-authored-by: Felix Exner <[email protected]>

Author: mergify[bot]

ur_robot_driver/src/dashboard_client_ros.cpp

@@ -264,7 +264,7 @@ bool DashboardClientROS::connect()
 {
   timeval tv;
   // Timeout after which a call to the dashboard server will be considered failure if no answer has been received.
-  double time_buffer;
+  double time_buffer = 0;
   node_->get_parameter("receive_timeout", time_buffer);
   tv.tv_sec = time_buffer;
   tv.tv_usec = 0;