Avoid potential null dereferences.
Fix compiler warning.

network.c:63:2: warning: missing braces around initializer [-Wmissing-braces]
network.c:63:2: warning: (near initialization for 'ip4_any.ip.__u6_addr') [-Wmissing-braces]
Do not break strict-aliasing rules.

dcc-send.c:296:2: warning: dereferencing type-punned pointer
will break strict-aliasing rules
Merge pull request #54 from dajohi/dcc_send_strict_aliasing

Do not break strict-aliasing rules.
Merge pull request #50 from dajohi/cmd_null_deref

Avoid potential null dereferences.
Merge pull request #53 from dajohi/braces

Fix compiler warning.