Fix compiler warning
Fix compiler warning

yantrabuddhi/atomspace,rTreutlein/atomspace,williampma/atomspace,AmeBel/atomspace,cosmoharrigan/atomspace,cosmoharrigan/atomspace,inflector/atomspace,AmeBel/atomspace,rTreutlein/atomspace,ceefour/atomspace,misgeatgit/atomspace,inflector/atomspace,ArvinPan/atomspace,AmeBel/atomspace,cosmoharrigan/atomspace,rodsol/atomspace,williampma/atomspace,williampma/atomspace,rodsol/atomspace,rodsol/atomspace,inflector/atomspace,yantrabuddhi/atomspace,ArvinPan/atomspace,williampma/atomspace,inflector/atomspace,rTreutlein/atomspace,yantrabuddhi/atomspace,cosmoharrigan/atomspace,rTreutlein/atomspace,ceefour/atomspace,AmeBel/atomspace,ArvinPan/atomspace,misgeatgit/atomspace,misgeatgit/atomspace,misgeatgit/atomspace,rodsol/atomspace,ceefour/atomspace,inflector/atomspace,yantrabuddhi/atomspace,rTreutlein/atomspace,misgeatgit/atomspace,AmeBel/atomspace,yantrabuddhi/atomspace,ArvinPan/atomspace,ceefour/atomspace