datatypes: avoid redundant __FUNCTION__
datatypes: avoid redundant __FUNCTION__

virLibConnError already includes __FUNCTION__ in its output, so we
were redundant.  Furthermore, clang warns that __FUNCTION__ is not
a string literal (at least __FUNCTION__ will never contain %, so
it was not a security risk).

* src/datatypes.c: Replace __FUNCTION__ with a descriptive string.

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