examples/lwm2m_test: fix a compilation error on prv_status_to_string
examples/lwm2m_test: fix a compilation error on prv_status_to_string

This commit fixes a compilation error on lwm2m_test example.

  commandline.c: In function 'prv_status_to_string':
  commandline.c:404:37: error: expected expression before 'return'
     #define CODE_TO_STRING(X)   case X:(return #X)
                                     ^
  commandline.c:409:3: note: in expansion of macro 'CODE_TO_STRING'
     CODE_TO_STRING(COAP_NO_ERROR);

Change-Id: I1c7afb3d07ca1e09545f5eb92167641f7d6e839a
Signed-off-by: Junyeon LEE <ddc45265127aa1feb4b01be10ec1f0d25d062d3d@samsung.com>

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