Use some int types in Planner

Marlin/planner.cpp

@@ -133,7 +133,7 @@ float Planner::min_feedrate_mm_s,
 
 // private:
 
-long Planner::position[NUM_AXIS] = { 0 };
+int32_t Planner::position[NUM_AXIS] = { 0 };
 
 uint32_t Planner::cutoff_long;
 
@@ -675,7 +675,7 @@ void Planner::_buffer_line(const float &a, const float &b, const float &c, const
     }
   #endif
 
-  const long da = target[X_AXIS] - position[X_AXIS],
+  const int32_t da = target[X_AXIS] - position[X_AXIS],
                 db = target[Y_AXIS] - position[Y_AXIS],
                 dc = target[Z_AXIS] - position[Z_AXIS];
 
@@ -706,7 +706,7 @@ void Planner::_buffer_line(const float &a, const float &b, const float &c, const
   if (DEBUGGING(DRYRUN))
     position[E_AXIS] = target[E_AXIS];
 
-  long de = target[E_AXIS] - position[E_AXIS];
+  int32_t de = target[E_AXIS] - position[E_AXIS];
 
   #if ENABLED(PREVENT_COLD_EXTRUSION) || ENABLED(PREVENT_LENGTHY_EXTRUDE)
     if (de) {
@@ -1386,7 +1386,7 @@ void Planner::_set_position_mm(const float &a, const float &b, const float &c, c
   #else
     #define _EINDEX E_AXIS
   #endif
-  const long na = position[X_AXIS] = LROUND(a * axis_steps_per_mm[X_AXIS]),
+  const int32_t na = position[X_AXIS] = LROUND(a * axis_steps_per_mm[X_AXIS]),
                 nb = position[Y_AXIS] = LROUND(b * axis_steps_per_mm[Y_AXIS]),
                 nc = position[Z_AXIS] = LROUND(c * axis_steps_per_mm[Z_AXIS]),
                 ne = position[E_AXIS] = LROUND(e * axis_steps_per_mm[_EINDEX]);

Marlin/planner.h

@@ -182,7 +182,7 @@ class Planner {
      * The current position of the tool in absolute steps
      * Recalculated if any axis_steps_per_mm are changed by gcode
      */
-    static long position[NUM_AXIS];
+    static int32_t position[NUM_AXIS];
 
     /**
      * Speed of previous path line segment