nimble/host: NULL assign data pointer after free

[rahult-github]

After buffer is freed, explicitly NULL assign the pointer to data.

[rahult-github]

@sjanc Please take a look and review

[rahult-github]

Hi @sjanc ,

So data here is the pointer which is passed as parameter to ble_gap_ext_adv_set_data. Apps like bleprph, create a data pointer, allocate it and then invoke ble_gap_ext_adv_set_data . Since the function does have the code to free the "os_mbuf *data" , this change is to also NULL initialize it.

[andrzej-kaczmarek]

you set local variable literally just before returning from function. that is just pointless.