gnrc_ipv6_nib: fix several issues found with LLVM's static code analyzer (only critical) [backport 2018.10] #10359
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Backport of #10358
Contribution description
This takes out the most critical fixes out of #10350.
Testing procedure
Execute make -C examples/gnrc_networking scan-build. It should pass. For functionality tests I recommend to use the a subset of the tests outlined in the release specifications.
Issues/PRs references
Contains parts of #10350 but can be merged independently.