samples: net: rpl_br: Fix coverity issues
Fixes: #7717
Fixes: #7720
Fixes: #7730
Coverity-CID: 186041
Coverity-CID: 186053
Coverity-CID: 186057
Signed-off-by:
Ravi kumar Veeramally <ravikumar.veeramally@linux.intel.com>
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