Followup to #8706

Marlin/src/module/probe.cpp

     // Do a first probe at the fast speed
     if (do_probe_move(-10, Z_PROBE_SPEED_FAST)) return NAN;
 
+    float first_probe_z = current_position[Z_AXIS];
+
     #if ENABLED(DEBUG_LEVELING_FEATURE)
-      float first_probe_z = current_position[Z_AXIS];
       if (DEBUGGING(LEVELING)) SERIAL_ECHOLNPAIR("1st Probe Z:", first_probe_z);
     #endif