Passing current_hci_state as struct creates a copy that is unmodified after return

[r10kindsofpeople]

When you create a function such as:
void start_hci_scan(struct hci_state current_hci_state)
any changes within start_hci_scan will get discarded (like error states and messages)

To fix, the structure can be passed as a pointer, or as a reference, like
void start_hci_scan(struct hci_state **&**current_hci_state)

In my case, hci_le_set_scan_parameters was returning an error, but the error was getting discarded.

[chenxiaosonggithub]

I found this problem too.