Remove buffer overrun that leads to a segfault on ipv6 network.

Remove buffer overrun that leads to a segfault on ipv6 network.

strcpy copies the \0 of its src argument, therefore the following line
is unneeded. Ironically, it can lead to a nasty segfault on a network
that supports ipv6. In fact, it prevented me from access such a
network using DHCP.

Signed-off-by: Sidney Amani <seed95@gmail.com>