[riot-notifications] [RIOT-OS/RIOT] gnrc/nib: consolidate prefix removal code in _nib_offl_remove_prefix() (#16729)

benpicco notifications at github.com
Fri Aug 13 17:47:25 CEST 2021

The RIOT community cares a lot about code quality.
Therefore, before describing what your contribution is about, we would like
you to make sure that your modifications are compliant with the RIOT
coding conventions, see https://github.com/RIOT-OS/RIOT/wiki/Coding-conventions.

### Contribution description

There are three places in which a prefix gets removed:

 - lifetime timeout in `_handle_pfx_timeout()`
 - RA handling with PIO with lifetime = 0 in `_remove_prefix()`
 - manually calling the `nib prefix del` shell command resulting in `gnrc_ipv6_nib_pl_del()`

However, they all do slightly different things. The code in `_handle_pfx_timeout()` appears to be the most complete, so move it to a common function that can be used by the other cases as well. 

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### Issues/PRs references

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-- Commit Summary --

  * gnrc/nib: consolidate prefix removal code in _nib_offl_remove_prefix()

-- File Changes --

    M sys/net/gnrc/network_layer/ipv6/nib/_nib-internal.c (21)
    M sys/net/gnrc/network_layer/ipv6/nib/_nib-internal.h (10)
    M sys/net/gnrc/network_layer/ipv6/nib/nib.c (14)
    M sys/net/gnrc/network_layer/ipv6/nib/nib_pl.c (4)

-- Patch Links --


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