✏️ Followup to Six Linear Axes (#22056)

Marlin/src/module/endstops.h

@@ -223,7 +223,7 @@ class Endstops {
       typedef struct {
         union {
           bool any;
-          struct { bool x:1, y:1, z:1; };
+          struct { bool LINEAR_AXIS_LIST(x:1, y:1, z:1, i:1, j:1, k:1); };
         };
       } tmc_spi_homing_t;
       static tmc_spi_homing_t tmc_spi_homing;