examples/libcoap_client : bug fix, deinitializes global variables
examples/libcoap_client : bug fix, deinitializes global variables

This commit is patch to deinitialize global variables

Change-Id: I1dd45b79d1a76fb0a0dcba86d792c17437cc6334
Signed-off-by: Jin-Seong Kim <c7ef485e0ddc445bcfb224daa3f265bce32dcc94@samsung.com>

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