AP_HAL_AVR: check in utility/ISRRegistry

libraries/AP_HAL_AVR/utility/ISRRegistry.cpp

@@ -6,13 +6,7 @@
 
 using namespace AP_HAL_AVR;
 
-proc_ptr ISRRegistry::_registry[ISR_REGISTRY_NUM_SLOTS];
+proc_ptr ISRRegistry::_registry[ISR_REGISTRY_NUM_SLOTS] = {NULL};
-
-void ISRRegistry::init() {
-    for(int i = 0; i < ISR_REGISTRY_NUM_SLOTS; i++) {
-        _registry[i] = NULL;
-    }
-}
 
 int ISRRegistry::register_signal(int signal, proc_ptr proc)
 {

libraries/AP_HAL_AVR/utility/ISRRegistry.h

@@ -14,7 +14,6 @@ typedef void (*proc_ptr)(void);
 
 class AP_HAL_AVR::ISRRegistry {
 public:
-    void init();
     int register_signal(int isr_number, proc_ptr proc);
     int unregister_signal(int isr_number);