Merge pull request #783 from MissionSt/fix/syntax-error

Fix compile error

Marlin/Marlin_main.cpp

   }
 }
 #define HOMEAXIS(LETTER) homeaxis(LETTER##_AXIS)
-+void refresh_cmd_timeout(void)
+void refresh_cmd_timeout(void)
 {
   previous_millis_cmd = millis();
 }