dsift: fix typo
dsift: fix typo

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