external/wakaama: fix a trivial compilation error
external/wakaama: fix a trivial compilation error

This commit fixes a build error. The length of socket address should be
sa->sa_len = p->ai_addrlen with CONFIG_NET_LWIP configuration.

Change-Id: I88f396abd32ae805a157a62198ba36750294d7d4
Signed-off-by: Jin-Seong Kim <c7ef485e0ddc445bcfb224daa3f265bce32dcc94@samsung.com>

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