netutils/dhcpd: minor patch for handling exception case
netutils/dhcpd: minor patch for handling exception case

This commit is the patch to handling exception case
 - when closing sockfd, sockfd may receive a negative value

Change-Id: Id6a304d8b80230a8db6972a3c548b8663079ef30
Signed-off-by: Wonsang Ryou <bc48fb2bc21aa3a9d3ccd13729d9fc0f5ca913dd@samsung.com>

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