Simplify TMC monitor code

Marlin/src/feature/tmc_util.cpp

     #endif
 
     if (need_update_error_counters || need_debug_reporting) {
-      #if AXIS_IS_TMC(X)
+
-        if (monitor_tmc_driver(stepperX, need_update_error_counters, need_debug_reporting)) {
+      #if AXIS_IS_TMC(X) || AXIS_IS_TMC(X2)
-          #if AXIS_IS_TMC(X2)
+      {
-            step_current_down(stepperX2);
+        bool result = false;
-          #endif
+        #if AXIS_IS_TMC(X)
-        }
+          if (monitor_tmc_driver(stepperX, need_update_error_counters, need_debug_reporting)) result = true;
-      #endif
+        #endif
-      #if AXIS_IS_TMC(X2)
+        #if AXIS_IS_TMC(X2)
-        if (monitor_tmc_driver(stepperX2, need_update_error_counters, need_debug_reporting)) {
+          if (monitor_tmc_driver(stepperX2, need_update_error_counters, need_debug_reporting)) result = true;
+        #endif
+        if (result) {
           #if AXIS_IS_TMC(X)
             step_current_down(stepperX);
           #endif
-        }
+          #if AXIS_IS_TMC(X2)
-      #endif
+            step_current_down(stepperX2);
-      #if AXIS_IS_TMC(Y)
-        if (monitor_tmc_driver(stepperY, need_update_error_counters, need_debug_reporting)) {
-          #if AXIS_IS_TMC(Y2)
-            step_current_down(stepperY2);
           #endif
         }
+      }
       #endif
-      #if AXIS_IS_TMC(Y2)
+
-        if (monitor_tmc_driver(stepperY2, need_update_error_counters, need_debug_reporting)) {
+      #if AXIS_IS_TMC(Y) || AXIS_IS_TMC(Y2)
+      {
+        bool result = false;
+        #if AXIS_IS_TMC(Y)
+          if (monitor_tmc_driver(stepperY, need_update_error_counters, need_debug_reporting)) result = true;
+        #endif
+        #if AXIS_IS_TMC(Y2)
+          if (monitor_tmc_driver(stepperY2, need_update_error_counters, need_debug_reporting)) result = true;
+        #endif
+        if (result) {
           #if AXIS_IS_TMC(Y)
             step_current_down(stepperY);
           #endif
-        }
+          #if AXIS_IS_TMC(Y2)
-      #endif
+            step_current_down(stepperY2);
-      #if AXIS_IS_TMC(Z)
-        if (monitor_tmc_driver(stepperZ, need_update_error_counters, need_debug_reporting)) {
-          #if AXIS_IS_TMC(Z2)
-            step_current_down(stepperZ2);
-          #endif
-          #if AXIS_IS_TMC(Z3)
-            step_current_down(stepperZ3);
-          #endif
-        }
-      #endif
-      #if AXIS_IS_TMC(Z2)
-        if (monitor_tmc_driver(stepperZ2, need_update_error_counters, need_debug_reporting)) {
-          #if AXIS_IS_TMC(Z)
-            step_current_down(stepperZ);
-          #endif
-          #if AXIS_IS_TMC(Z3)
-            step_current_down(stepperZ3);
           #endif
         }
+      }
       #endif
-      #if AXIS_IS_TMC(Z3)
+
-        if (monitor_tmc_driver(stepperZ3, need_update_error_counters, need_debug_reporting)) {
+      #if AXIS_IS_TMC(Z) || AXIS_IS_TMC(Z2) || AXIS_IS_TMC(Z3)
+      {
+        bool result = false;
+        #if AXIS_IS_TMC(Z)
+          if (monitor_tmc_driver(stepperZ, need_update_error_counters, need_debug_reporting)) result = true;
+        #endif
+        #if AXIS_IS_TMC(Z2)
+          if (monitor_tmc_driver(stepperZ2, need_update_error_counters, need_debug_reporting)) result = true;
+        #endif
+        #if AXIS_IS_TMC(Z3)
+          if (monitor_tmc_driver(stepperZ3, need_update_error_counters, need_debug_reporting)) result = true;
+        #endif
+        if (result) {
           #if AXIS_IS_TMC(Z)
             step_current_down(stepperZ);
           #endif
           #if AXIS_IS_TMC(Z2)
             step_current_down(stepperZ2);
           #endif
+          #if AXIS_IS_TMC(Z3)
+            step_current_down(stepperZ3);
+          #endif
         }
+      }
       #endif
+
       #if AXIS_IS_TMC(E0)
         (void)monitor_tmc_driver(stepperE0, need_update_error_counters, need_debug_reporting);
       #endif