mathop.c: fixes a bug that caused the Jensen-Shannon disance function to return an undefined value
mathop.c: fixes a bug that caused the Jensen-Shannon disance function to return an undefined value

rxl194/vlfeat,qubick/vlfeat,richarddzh/vlfeat,WangDequan/vlfeat,rxl194/vlfeat,j-bo/vlfeat,rxl194/vlfeat,hongzhili/vlfeat,hongzhili/vlfeat,erexhepa/vlfeat,qubick/vlfeat,erexhepa/vlfeat,richarddzh/vlfeat,richarddzh/vlfeat,richarddzh/vlfeat,mylxiaoyi/vlfeat,hongzhili/vlfeat,vlfeat/vlfeat,cvfish/vlfeat,cvfish/vlfeat,richarddzh/vlfeat,vlfeat/vlfeat,CansenJIANG/vlfeat,erexhepa/vlfeat,cvfish/vlfeat,hongzhili/vlfeat,rxl194/vlfeat,CansenJIANG/vlfeat,cvfish/vlfeat,WangDequan/vlfeat,WangDequan/vlfeat,WangDequan/vlfeat,j-bo/vlfeat,cvfish/vlfeat,mylxiaoyi/vlfeat,rxl194/vlfeat,qubick/vlfeat,erexhepa/vlfeat,mylxiaoyi/vlfeat,vlfeat/vlfeat,hongzhili/vlfeat,mylxiaoyi/vlfeat,mylxiaoyi/vlfeat,WangDequan/vlfeat,vlfeat/vlfeat,CansenJIANG/vlfeat,richarddzh/vlfeat,qubick/vlfeat,cvfish/vlfeat,j-bo/vlfeat,WangDequan/vlfeat,qubick/vlfeat,CansenJIANG/vlfeat,rxl194/vlfeat,CansenJIANG/vlfeat,hongzhili/vlfeat,mylxiaoyi/vlfeat,CansenJIANG/vlfeat,erexhepa/vlfeat,qubick/vlfeat,erexhepa/vlfeat,j-bo/vlfeat,vlfeat/vlfeat,j-bo/vlfeat,vlfeat/vlfeat