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Import upstream commit "f19fa4b Fix a cast so it can be compiled with gcc-6"
in order to fix building ndppd with recent gcc versions.
Fixes the following error spotted by the build bots:
src/iface.cc: In static member function 'static ndppd::ptr<ndppd::iface> ndppd::iface::open_pfd(const string&)':
src/iface.cc:153:5: error: narrowing conversion of '-1' from 'int' to '__u32 {aka unsigned int}' inside { } [-Wnarrowing]
Signed-off-by: Jo-Philipp Wich <jo@mein.io>