Fix variable name

src/segway_RMP400.cpp

@@ -192,13 +192,13 @@ CSegwayRMP400::get_yaw_displacement()
 {
     need_to_be_connected();
 
-    float  yaw_displacement_mts = (segways_[0]->get_yaw_displacement() +
+    float  yaw_displacement_tmp = (segways_[0]->get_yaw_displacement() +
                                    segways_[1]->get_yaw_displacement()) / 2;
 
     if (use_correction_wheel_factor_)
-        fix_with_wheel_factor(yaw_displacement_mts);
+        fix_with_wheel_factor(yaw_displacement_tmp);
 
-    yaw_displacement_ = yaw_displacement_mts * 2 * PI; // convert to radians
+    yaw_displacement_ = yaw_displacement_tmp * 2 * PI; // convert to radians
     return yaw_displacement_;
 }