Sanity check homing bumps

Marlin/Marlin_main.cpp

@@ -9104,7 +9104,7 @@ void stop() {
  */
 void setup() {
 
-  #if ENABLED(DISABLE_JTAG)
+  #ifdef DISABLE_JTAG
     // Disable JTAG on AT90USB chips to free up pins for IO
     MCUCR = 0x80;
     MCUCR = 0x80;

Marlin/SanityCheck.h

@@ -450,6 +450,13 @@
 
 #endif
 
+/**
+ * Homing Bump
+ */
+#if X_HOME_BUMP_MM < 0 || Y_HOME_BUMP_MM < 0 || Z_HOME_BUMP_MM < 0
+  #error "[XYZ]_HOME_BUMP_MM must be greater than or equal to 0."
+#endif
+
 /**
  * Make sure Z_SAFE_HOMING point is reachable
  */