test_gmm.c: fix to make it compatible with new VLAD
test_gmm.c: fix to make it compatible with new VLAD

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