6lowpan: free fragment buffer in error case
6lowpan: fix buffer overrun in decompression
IPv6: allow complete in ipv6_addr_init_prefix

If the specified prefix is a full IPv6 address, no bits remain.
Fixes a possible buffer overrun.
net_if: fix buffer overruns
6lowpan: do not overrun in context_remove
net: fix buffer overrun in socket initialization
Merge pull request #1980 from OlegHahm/coverity_fixes

net: fixes some finding from coverity