netutils/libcoap : minor patch to fix build warning on CPP compiler
netutils/libcoap : minor patch to fix build warning on CPP compiler

This commit is minor patch to fix build warning on CPP compiler
1. compile warning log
warning: comparison between signed and unsigned integer expressions
[-Wsign-compare]
  if (size <= (bit >> 3)) {
2. solution
adding casting operator after bit shift operations

Change-Id: I71a512951523f0fb7317e684fdc0f4d8ee4a9cd8
Signed-off-by: Jin-Seong Kim <c7ef485e0ddc445bcfb224daa3f265bce32dcc94@samsung.com>

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