lwip/dhcps: fix improper use of inet_addr()
lwip/dhcps: fix improper use of inet_addr()

Change-Id: Ic639d704ac83aea2d16265f6c01862df7ef8e3a6
Signed-off-by: EunBong Song <1a7e7e98e070490e67aa35ab67fbf9fdda8f48ac@samsung.com>

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