Print no-operation performed when no nk3 found in change-pin

Author: sosthene-nitrokey

src/operations_ccid.c

@@ -68,6 +68,7 @@ int nk3_change_pin(struct Device *dev, const char *old_pin, const char*new_pin)
     struct libusb_device_descriptor usb_desc;
 
     if (!dev->mp_devhandle_ccid) {
+        printf("No Nitrokey 3 found. No operation performed\n");
         return RET_NO_ERROR;    
     }
 
@@ -81,6 +82,7 @@ int nk3_change_pin(struct Device *dev, const char *old_pin, const char*new_pin)
 
 
     if (usb_desc.idVendor != NITROKEY_USB_VID || usb_desc.idProduct != NITROKEY_3_USB_PID) {
+        printf("No Nitrokey 3 found. No operation performed\n");
         return RET_NO_ERROR;    
     }