[riot-notifications] [RIOT-OS/RIOT] gnrc_rpl: do not assert netif on auto-init (#10895)

Martine Lenders notifications at github.com
Tue Jan 29 18:01:44 CET 2019

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### Contribution description
`gnrc_networking` is unusable when compiled for boards that do not have any network devices on-board due to an assertion in RPL's auto-init. I think this is pretty harsh. A friendly info message is enough, as it might not even be an error. Also, if one expects RPL to work without network interfaces they are a fool ;-). Also also, the `GNRC_NETIF_NUMOF != 1` case doesn't have this assertion either.
Put here the description of your contribution:
- describe which part(s) of RIOT is (are) involved
- if it's a bug fix, describe the bug that it solves and how it is solved
- you can also give more information to reviewers about how to test your changes

### Testing procedure
Compile `gnrc_networking` for a board without any on-board radios. Without this PR the board will run into a failed assertion on start-up. With it, it will just continue and print a message before the normal welcome message: "Unable to auto-initialize RPL. No interfaces found."
Details steps to test your contribution:
- which test/example to compile for which board and is there a 'test' command
- how to know that it was not working/available in master
- the expected success test output

### Issues/PRs references
None, but discovered in #10412.
Examples: Fixes #1234. See also #5678. Depends on PR #9876.

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-- Commit Summary --

  * gnrc_rpl: do not assert netif on auto-init

-- File Changes --

    M sys/net/gnrc/routing/rpl/gnrc_rpl_auto_init.c (6)

-- Patch Links --


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