Comment `return false` in motion functions

Marlin/Marlin_main.cpp

@@ -13027,7 +13027,6 @@ void set_current_from_steppers_for_axis(const AxisEnum axis) {
     }
     else {
       // Must already have been split on these border(s)
-      // This should be a rare case.
       buffer_line_to_destination(fr_mm_s);
       set_current_from_destination();
       return;
@@ -13096,7 +13095,6 @@ void set_current_from_steppers_for_axis(const AxisEnum axis) {
     }
     else {
       // Must already have been split on these border(s)
-      // This should be a rare case.
       buffer_line_to_destination(fr_mm_s);
       set_current_from_destination();
       return;
@@ -13139,7 +13137,7 @@ void set_current_from_steppers_for_axis(const AxisEnum axis) {
     // If the move is only in Z/E don't split up the move
     if (!xdiff && !ydiff) {
       planner.buffer_line_kinematic(rtarget, _feedrate_mm_s, active_extruder);
-      return false;
+      return false; // caller will update current_position
     }
 
     // Fail if attempting move outside printable radius
@@ -13236,7 +13234,7 @@ void set_current_from_steppers_for_axis(const AxisEnum axis) {
       planner.buffer_line_kinematic(rtarget, _feedrate_mm_s, active_extruder);
     #endif
 
-    return false;
+    return false; // caller will update current_position
   }
 
 #else // !IS_KINEMATIC
@@ -13257,7 +13255,7 @@ void set_current_from_steppers_for_axis(const AxisEnum axis) {
           return true;                                                                    // all moves, including Z-only moves.
         #elif ENABLED(SEGMENT_LEVELED_MOVES)
           segmented_line_to_destination(MMS_SCALED(feedrate_mm_s));
-          return false;
+          return false; // caller will update current_position
         #else
           /**
            * For MBL and ABL-BILINEAR only segment moves when X or Y are involved.
@@ -13276,7 +13274,7 @@ void set_current_from_steppers_for_axis(const AxisEnum axis) {
     #endif // HAS_MESH
 
     buffer_line_to_destination(MMS_SCALED(feedrate_mm_s));
-    return false;
+    return false; // caller will update current_position
   }
 
 #endif // !IS_KINEMATIC

Marlin/ubl_motion.cpp

@@ -616,6 +616,8 @@
 
         } // segment loop
       } // cell loop
+
+      return false; // caller will update current_position
     }
 
   #endif // UBL_SEGMENTED