[riot-notifications] [RIOT] gnrc_sixlowpan_nd_router: cast before shifting (#3904)

[Martine Lenders]

`avr-gcc` was complaining about shifting the value out of the width of
type. This is a fix for that.
You can view, comment on, or merge this pull request online at:

  https://github.com/RIOT-OS/RIOT/pull/3904

-- Commit Summary --

  * gnrc_sixlowpan_nd_router: cast before shifting

-- File Changes --

    M sys/net/gnrc/network_layer/sixlowpan/nd/router/gnrc_sixlowpan_nd_router.c (4)

-- Patch Links --

https://github.com/RIOT-OS/RIOT/pull/3904.patch
https://github.com/RIOT-OS/RIOT/pull/3904.diff

---
Reply to this email directly or view it on GitHub:
https://github.com/RIOT-OS/RIOT/pull/3904
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