🔧 Fix Auto-Fan / Controller-Fan pin conflict check (#24648)

Marlin/src/inc/SanityCheck.h

@@ -2197,14 +2197,22 @@ static_assert(Y_MAX_LENGTH >= Y_BED_SIZE, "Movement bounds (Y_MIN_POS, Y_MAX_POS
 #if ENABLED(USE_CONTROLLER_FAN)
   #if !HAS_CONTROLLER_FAN
     #error "USE_CONTROLLER_FAN requires a CONTROLLER_FAN_PIN. Define in Configuration_adv.h."
-  #elif E0_AUTO_FAN_PIN == CONTROLLER_FAN_PIN
+  #elif PIN_EXISTS(E0_AUTO_FAN) && E0_AUTO_FAN_PIN == CONTROLLER_FAN_PIN
     #error "You cannot set E0_AUTO_FAN_PIN equal to CONTROLLER_FAN_PIN."
-  #elif E1_AUTO_FAN_PIN == CONTROLLER_FAN_PIN
+  #elif PIN_EXISTS(E1_AUTO_FAN) && E1_AUTO_FAN_PIN == CONTROLLER_FAN_PIN
     #error "You cannot set E1_AUTO_FAN_PIN equal to CONTROLLER_FAN_PIN."
-  #elif E2_AUTO_FAN_PIN == CONTROLLER_FAN_PIN
+  #elif PIN_EXISTS(E2_AUTO_FAN) && E2_AUTO_FAN_PIN == CONTROLLER_FAN_PIN
     #error "You cannot set E2_AUTO_FAN_PIN equal to CONTROLLER_FAN_PIN."
-  #elif E3_AUTO_FAN_PIN == CONTROLLER_FAN_PIN
+  #elif PIN_EXISTS(E3_AUTO_FAN) && E3_AUTO_FAN_PIN == CONTROLLER_FAN_PIN
     #error "You cannot set E3_AUTO_FAN_PIN equal to CONTROLLER_FAN_PIN."
+  #elif PIN_EXISTS(E4_AUTO_FAN) && E4_AUTO_FAN_PIN == CONTROLLER_FAN_PIN
+    #error "You cannot set E4_AUTO_FAN_PIN equal to CONTROLLER_FAN_PIN."
+  #elif PIN_EXISTS(E5_AUTO_FAN) && E5_AUTO_FAN_PIN == CONTROLLER_FAN_PIN
+    #error "You cannot set E5_AUTO_FAN_PIN equal to CONTROLLER_FAN_PIN."
+  #elif PIN_EXISTS(E6_AUTO_FAN) && E6_AUTO_FAN_PIN == CONTROLLER_FAN_PIN
+    #error "You cannot set E6_AUTO_FAN_PIN equal to CONTROLLER_FAN_PIN."
+  #elif PIN_EXISTS(E7_AUTO_FAN) && E7_AUTO_FAN_PIN == CONTROLLER_FAN_PIN
+    #error "You cannot set E7_AUTO_FAN_PIN equal to CONTROLLER_FAN_PIN."
   #endif
 #endif