fix compile-time warning.
fix compile-time warning.

prateeksaxena2809/opencog,TheNameIsNigel/opencog,ArvinPan/opencog,printedheart/opencog,cosmoharrigan/atomspace,eddiemonroe/atomspace,sumitsourabh/opencog,roselleebarle04/opencog,ArvinPan/opencog,inflector/opencog,virneo/opencog,anitzkin/opencog,ceefour/opencog,prateeksaxena2809/opencog,jlegendary/opencog,virneo/opencog,rodsol/opencog,TheNameIsNigel/opencog,yantrabuddhi/atomspace,printedheart/opencog,andre-senna/opencog,shujingke/opencog,andre-senna/opencog,kim135797531/opencog,ArvinPan/atomspace,eddiemonroe/opencog,ArvinPan/opencog,Selameab/opencog,MarcosPividori/atomspace,jlegendary/opencog,ceefour/opencog,rohit12/atomspace,virneo/atomspace,ceefour/opencog,ceefour/opencog,misgeatgit/atomspace,iAMr00t/opencog,williampma/atomspace,rTreutlein/atomspace,cosmoharrigan/opencog,misgeatgit/opencog,shujingke/opencog,eddiemonroe/atomspace,ceefour/atomspace,misgeatgit/opencog,williampma/opencog,gavrieltal/opencog,printedheart/atomspace,TheNameIsNigel/opencog,yantrabuddhi/opencog,ArvinPan/opencog,virneo/opencog,sanuj/opencog,tim777z/opencog,anitzkin/opencog,inflector/opencog,Selameab/atomspace,ruiting/opencog,zhaozengguang/opencog,gavrieltal/opencog,kim135797531/opencog,AmeBel/opencog,inflector/opencog,andre-senna/opencog,misgeatgit/atomspace,ArvinPan/atomspace,virneo/atomspace,MarcosPividori/atomspace,inflector/opencog,misgeatgit/opencog,tim777z/opencog,jlegendary/opencog,printedheart/opencog,rodsol/atomspace,AmeBel/atomspace,rTreutlein/atomspace,misgeatgit/atomspace,Allend575/opencog,ArvinPan/atomspace,gaapt/opencog,rohit12/opencog,andre-senna/opencog,inflector/atomspace,inflector/opencog,kim135797531/opencog,sumitsourabh/opencog,kim135797531/opencog,anitzkin/opencog,sanuj/opencog,rodsol/atomspace,iAMr00t/opencog,yantrabuddhi/opencog,AmeBel/opencog,jswiergo/atomspace,eddiemonroe/atomspace,jswiergo/atomspace,yantrabuddhi/atomspace,williampma/opencog,yantrabuddhi/atomspace,rohit12/atomspace,jswiergo/atomspace,rohit12/opencog,shujingke/opencog,cosmoharrigan/opencog,sanuj/opencog,virneo/opencog,sumitsourabh/opencog,ruiting/opencog,ruiting/opencog,kim135797531/opencog,yantrabuddhi/opencog,gavrieltal/opencog,Allend575/opencog,cosmoharrigan/opencog,misgeatgit/opencog,printedheart/opencog,williampma/opencog,virneo/opencog,andre-senna/opencog,tim777z/opencog,kinoc/opencog,Tiggels/opencog,kim135797531/opencog,Tiggels/opencog,rohit12/opencog,misgeatgit/opencog,rodsol/atomspace,roselleebarle04/opencog,zhaozengguang/opencog,Selameab/opencog,tim777z/opencog,inflector/atomspace,tim777z/opencog,williampma/atomspace,rohit12/opencog,Allend575/opencog,UIKit0/atomspace,prateeksaxena2809/opencog,eddiemonroe/opencog,Tiggels/opencog,ceefour/opencog,eddiemonroe/opencog,virneo/opencog,inflector/atomspace,misgeatgit/atomspace,AmeBel/opencog,tim777z/opencog,roselleebarle04/opencog,rTreutlein/atomspace,Allend575/opencog,cosmoharrigan/opencog,misgeatgit/opencog,inflector/opencog,ceefour/atomspace,zhaozengguang/opencog,yantrabuddhi/opencog,rodsol/opencog,AmeBel/opencog,anitzkin/opencog,ArvinPan/atomspace,zhaozengguang/opencog,gaapt/opencog,jswiergo/atomspace,jlegendary/opencog,rohit12/atomspace,kinoc/opencog,UIKit0/atomspace,iAMr00t/opencog,cosmoharrigan/atomspace,kinoc/opencog,gavrieltal/opencog,misgeatgit/atomspace,rodsol/opencog,yantrabuddhi/opencog,ruiting/opencog,sumitsourabh/opencog,williampma/opencog,prateeksaxena2809/opencog,prateeksaxena2809/opencog,gavrieltal/opencog,virneo/atomspace,rTreutlein/atomspace,cosmoharrigan/opencog,Selameab/opencog,sanuj/opencog,iAMr00t/opencog,eddiemonroe/opencog,Allend575/opencog,ArvinPan/opencog,rohit12/opencog,andre-senna/opencog,TheNameIsNigel/opencog,UIKit0/atomspace,printedheart/opencog,cosmoharrigan/atomspace,AmeBel/opencog,rohit12/opencog,eddiemonroe/opencog,eddiemonroe/opencog,rodsol/opencog,ArvinPan/opencog,misgeatgit/opencog,kinoc/opencog,misgeatgit/opencog,sumitsourabh/opencog,inflector/opencog,rohit12/atomspace,virneo/opencog,TheNameIsNigel/opencog,roselleebarle04/opencog,ruiting/opencog,Allend575/opencog,sanuj/opencog,inflector/atomspace,eddiemonroe/atomspace,anitzkin/opencog,shujingke/opencog,printedheart/opencog,MarcosPividori/atomspace,eddiemonroe/opencog,roselleebarle04/opencog,kinoc/opencog,gaapt/opencog,printedheart/atomspace,ceefour/opencog,ruiting/opencog,kinoc/opencog,sumitsourabh/opencog,jlegendary/opencog,misgeatgit/opencog,yantrabuddhi/atomspace,printedheart/atomspace,williampma/opencog,rTreutlein/atomspace,TheNameIsNigel/opencog,MarcosPividori/atomspace,Selameab/opencog,Tiggels/opencog,prateeksaxena2809/opencog,gaapt/opencog,AmeBel/atomspace,shujingke/opencog,rodsol/opencog,roselleebarle04/opencog,eddiemonroe/atomspace,kim135797531/opencog,rodsol/opencog,zhaozengguang/opencog,jlegendary/opencog,gaapt/opencog,roselleebarle04/opencog,UIKit0/atomspace,gaapt/opencog,gaapt/opencog,cosmoharrigan/opencog,anitzkin/opencog,Selameab/opencog,williampma/atomspace,gavrieltal/opencog,inflector/opencog,ceefour/atomspace,andre-senna/opencog,AmeBel/opencog,cosmoharrigan/atomspace,rodsol/atomspace,Tiggels/opencog,AmeBel/opencog,Selameab/opencog,ceefour/opencog,sanuj/opencog,Tiggels/opencog,AmeBel/atomspace,AmeBel/atomspace,sumitsourabh/opencog,ceefour/atomspace,iAMr00t/opencog,williampma/atomspace,Selameab/atomspace,kinoc/opencog,AmeBel/atomspace,printedheart/atomspace,jlegendary/opencog,williampma/opencog,yantrabuddhi/opencog,gavrieltal/opencog,prateeksaxena2809/opencog,inflector/atomspace,Allend575/opencog,Selameab/atomspace,yantrabuddhi/atomspace,iAMr00t/opencog,shujingke/opencog,Selameab/atomspace,anitzkin/opencog,virneo/atomspace,zhaozengguang/opencog,shujingke/opencog,yantrabuddhi/opencog,ruiting/opencog