external/wakaama : change type to fix a error.
external/wakaama : change type to fix a error.

This commit is to fix a logical error.
Expression 'len < ((1 << 16) + 269)' is always true,
which may be caused by a logical error.

Change-Id: I07408010f17ff85458fd666baaedce7f8571f343
Signed-off-by: Seongeun Choi <ce57d146867da55caaecfb63d001966c99394631@samsung.com>

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