sysinfo: fix illegal NULL return
sysinfo: fix illegal NULL return

If virSysinfoParse{BIOS,System,Processor,Memory}()
can't find newline('\n'), these return NULL.
This patch fixes this.

Signed-off-by: Minoru Usui <37b08d1ce4206f028979628b079e74679ee607fc@mxm.nes.nec.co.jp>

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