[2.0.x] SECURITYFIX missing max temp error when PID is used (#11717)

Marlin/src/module/temperature.cpp

@@ -1722,14 +1722,12 @@ void Temperature::readings_ready() {
 
   for (uint8_t e = 0; e < COUNT(temp_dir); e++) {
     const int16_t tdir = temp_dir[e], rawtemp = current_temperature_raw[e] * tdir;
-    const bool heater_on = 0 <
+    const bool heater_on = (target_temperature[e] > 0)
       #if ENABLED(PIDTEMP)
-        soft_pwm_amount[e]
-      #else
-        target_temperature[e]
+        || (soft_pwm_amount[e] > 0)
       #endif
     ;
-    if (rawtemp > maxttemp_raw[e] * tdir && heater_on) max_temp_error(e);
+    if (rawtemp > maxttemp_raw[e] * tdir) max_temp_error(e);
     if (rawtemp < minttemp_raw[e] * tdir && !is_preheating(e) && heater_on) {
       #ifdef MAX_CONSECUTIVE_LOW_TEMPERATURE_ERROR_ALLOWED
         if (++consecutive_low_temperature_error[e] >= MAX_CONSECUTIVE_LOW_TEMPERATURE_ERROR_ALLOWED)
@@ -1748,14 +1746,12 @@ void Temperature::readings_ready() {
     #else
       #define GEBED >=
     #endif
-    const bool bed_on = 0 <
+    const bool bed_on = (target_temperature_bed > 0)
       #if ENABLED(PIDTEMPBED)
-        soft_pwm_amount_bed
-      #else
-        target_temperature_bed
+        || (soft_pwm_amount_bed > 0)
       #endif
     ;
-    if (current_temperature_bed_raw GEBED bed_maxttemp_raw && bed_on) max_temp_error(-1);
+    if (current_temperature_bed_raw GEBED bed_maxttemp_raw) max_temp_error(-1);
     if (bed_minttemp_raw GEBED current_temperature_bed_raw && bed_on) min_temp_error(-1);
   #endif
 }