xend_internal: don't let invalid input provoke NULL dereference
xend_internal: don't let invalid input provoke NULL dereference

* src/xen/xend_internal.c (xenDaemonOpen_unix): Do not dereference
a NULL "conn".  Move first deref to follow the "conn == NULL" test.

warewolf/libvirt,trainstack/libvirt,wiedi/libvirt,rbu/libvirt,novel/fbsd-libvirt,sshah-solarflare/Libvirt-PCI-passthrough-,libvirt/libvirt,kantai/libvirt-vfork,fabianfreyer/libvirt,wiedi/libvirt,fabianfreyer/libvirt,danwent/libvirt-ovs,foomango/libvirt,crobinso/libvirt,agx/libvirt,rmarwaha/libvirt1,zhlcindy/libvirt-1.1.4-maintain,novel/fbsd-libvirt,warewolf/libvirt,danwent/libvirt-ovs,jardasgit/libvirt,shugaoye/libvirt,dumbbell/libvirt,bjzhang/libvirt,andreabolognani/libvirt,andreabolognani/libvirt,iam-TJ/libvirt,zippy2/libvirt,VenkatDatta/libvirt,leilihh/libvirt,crobinso/libvirt,emaste/libvirt,agx/libvirt,wiedi/libvirt,nertpinx/libvirt,trainstack/libvirt,datto/libvirt,shugaoye/libvirt,usc-isi/libvirt,andreabolognani/libvirt,jardasgit/libvirt,rbu/libvirt,rmarwaha/libvirt1,elmarco/libvirt,rmarwaha/libvirt1,siboulet/libvirt-openvz,fabianfreyer/libvirt,nertpinx/libvirt,bjzhang/libvirt,siboulet/libvirt-openvz,datto/libvirt,fabianfreyer/libvirt,wiedi/libvirt,rmarwaha/libvirt1,danwent/libvirt-ovs,bjzhang/libvirt,iam-TJ/libvirt,jfehlig/libvirt,amery/libvirt-vserver,leilihh/libvirt,libvirt/libvirt,shugaoye/libvirt,agx/libvirt,kantai/libvirt-vfork,rmarwaha/libvirt,cbosdo/libvirt,usc-isi/libvirt,datto/libvirt,eskultety/libvirt,cbosdo/libvirt,novel/fbsd-libvirt,iam-TJ/libvirt,taget/libvirt,nertpinx/libvirt,novel/fbsd-libvirt,rmarwaha/libvirt1,jardasgit/libvirt,emaste/libvirt,sshah-solarflare/Libvirt-PCI-passthrough-,jeckersb/libvirt,rlaager/libvirt,jfehlig/libvirt,rbu/libvirt,bjzhang/libvirt,dumbbell/libvirt,VenkatDatta/libvirt,cbosdo/libvirt,leilihh/libvirt,jeckersb/libvirt,trainstack/libvirt,soulxu/libvirt-xuhj,novel/fbsd-libvirt,rmarwaha/libvirt,jfehlig/libvirt,jeckersb/libvirt,warewolf/libvirt,usc-isi/libvirt,foomango/libvirt,emaste/libvirt,kantai/libvirt-vfork,cbosdo/libvirt,taget/libvirt,novel/fbsd-libvirt,iam-TJ/libvirt,iam-TJ/libvirt,zhlcindy/libvirt-1.1.4-maintain,eskultety/libvirt,novel/fbsd-libvirt,amery/libvirt-vserver,zippy2/libvirt,bjzhang/libvirt,amery/libvirt-vserver,emaste/libvirt,olafhering/libvirt,soulxu/libvirt-xuhj,rlaager/libvirt,emaste/libvirt,cbosdo/libvirt,shugaoye/libvirt,nertpinx/libvirt,dumbbell/libvirt,elmarco/libvirt,elmarco/libvirt,zippy2/libvirt,VenkatDatta/libvirt,warewolf/libvirt,olafhering/libvirt,zhlcindy/libvirt-1.1.4-maintain,amery/libvirt-vserver,trainstack/libvirt,iam-TJ/libvirt,leilihh/libvirt,elmarco/libvirt,shugaoye/libvirt,wiedi/libvirt,novel/fbsd-libvirt,rbu/libvirt,foomango/libvirt,kantai/libvirt-vfork,rbu/libvirt,warewolf/libvirt,iam-TJ/libvirt,rlaager/libvirt,emaste/libvirt,libvirt/libvirt,soulxu/libvirt-xuhj,olafhering/libvirt,rmarwaha/libvirt,olafhering/libvirt,agx/libvirt,taget/libvirt,sshah-solarflare/Libvirt-PCI-passthrough-,taget/libvirt,usc-isi/libvirt,datto/libvirt,amery/libvirt-vserver,soulxu/libvirt-xuhj,dumbbell/libvirt,trainstack/libvirt,leilihh/libvirt,rlaager/libvirt,dumbbell/libvirt,kantai/libvirt-vfork,jfehlig/libvirt,libvirt/libvirt,agx/libvirt,rmarwaha/libvirt1,zippy2/libvirt,rmarwaha/libvirt,foomango/libvirt,leilihh/libvirt,taget/libvirt,jeckersb/libvirt,eskultety/libvirt,crobinso/libvirt,danwent/libvirt-ovs,rlaager/libvirt,eskultety/libvirt,andreabolognani/libvirt,usc-isi/libvirt,wiedi/libvirt,warewolf/libvirt,sshah-solarflare/Libvirt-PCI-passthrough-,jeckersb/libvirt,jardasgit/libvirt,trainstack/libvirt,andreabolognani/libvirt,nertpinx/libvirt,danwent/libvirt-ovs,eskultety/libvirt,rmarwaha/libvirt,wiedi/libvirt,warewolf/libvirt,foomango/libvirt,crobinso/libvirt,siboulet/libvirt-openvz,elmarco/libvirt,soulxu/libvirt-xuhj,rmarwaha/libvirt,zhlcindy/libvirt-1.1.4-maintain,jardasgit/libvirt,siboulet/libvirt-openvz,VenkatDatta/libvirt,novel/fbsd-libvirt,zhlcindy/libvirt-1.1.4-maintain,jeckersb/libvirt,dumbbell/libvirt,sshah-solarflare/Libvirt-PCI-passthrough-,VenkatDatta/libvirt,emaste/libvirt,siboulet/libvirt-openvz,jeckersb/libvirt,fabianfreyer/libvirt,trainstack/libvirt,datto/libvirt