crypto: get rid of compiler warnings
core: shadowing in priority_queue_print

The variable `node` shadows the parameter `node`. The access of
`node->first` would not compile, because there is no member `first` in
`priority_queue_t`.
Merge pull request #1563 from Kijewski/priority_queue_print-typo

core: shadowing in priority_queue_print
Merge pull request #1522 from OlegHahm/crypto_cleanup

crypto: get rid of compiler warnings