[riot-notifications] [RIOT-OS/RIOT] gnrc_sock: imply end-point netif only if unset (#16643)

Martine Lenders notifications at github.com
Wed Jul 14 10:38:13 CEST 2021

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### Contribution description
Found this while testing https://github.com/RIOT-OS/RIOT/pull/16606: When using the `gnrc_netif_single` optimization module `gnrc_sock` basically accepts any `netif` value in the `gnrc_sock*_ep_t` structs, as it is just overwritten with the ID only existing network interface. While this seems like a nice extra from a shell user perspective, I wouldn't call this behavior valid and it also might cause some faulty behavior if e.g. invalid interface IDs are received from the network (as might be the case with DHCPv6's [Interface ID option]() https://github.com/RIOT-OS/RIOT/pull/16606).

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### Testing procedure
The following tests should still pass:
- `tests/gnrc_sock_udp`
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-- Commit Summary --

  * gnrc_sock: imply end-point netif only if unset

-- File Changes --

    M sys/net/gnrc/sock/include/gnrc_sock_internal.h (2)

-- Patch Links --


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