Shorthand for home-after-deactivate

Marlin/src/gcode/calibrate/G28.cpp

@@ -200,18 +200,10 @@ void GcodeSuite::G28(const bool always_home_all) {
     }
   #endif
 
-  if (parser.boolval('O')) {
-    if (
-      #if ENABLED(HOME_AFTER_DEACTIVATE)
-        all_axes_known()  // homing needed anytime steppers deactivate
-      #else
-        all_axes_homed()  // homing needed only if never homed
-      #endif
-    ) {
+  if (!homing_needed() && parser.boolval('O')) {
     if (DEBUGGING(LEVELING)) DEBUG_ECHOLNPGM("> homing not needed, skip\n<<< G28");
     return;
   }
-  }
 
   // Wait for planner moves to finish!
   planner.synchronize();

Marlin/src/module/motion.h

@@ -42,6 +42,16 @@ FORCE_INLINE bool all_axes_known() { return (axis_known_position & xyz_bits) ==
 FORCE_INLINE void set_all_unhomed() { axis_homed = 0; }
 FORCE_INLINE void set_all_unknown() { axis_known_position = 0; }
 
+FORCE_INLINE bool homing_needed() {
+  return !(
+    #if ENABLED(HOME_AFTER_DEACTIVATE)
+      all_axes_known()
+    #else
+      all_axes_homed()
+    #endif
+  );
+}
+
 // Error margin to work around float imprecision
 constexpr float slop = 0.0001;