conf: error out for multiple protocol elements while parsing chardev
conf: error out for multiple protocol elements while parsing chardev

Remove check whether a variable was already set because the element
is parsed only once now.

Signed-off-by: Pavel Hrdina <d4772d05997b8abf035041e3b4f4996380ea7e7a@redhat.com>

fabianfreyer/libvirt,andreabolognani/libvirt,fabianfreyer/libvirt,zippy2/libvirt,jardasgit/libvirt,nertpinx/libvirt,zippy2/libvirt,libvirt/libvirt,crobinso/libvirt,andreabolognani/libvirt,fabianfreyer/libvirt,jfehlig/libvirt,eskultety/libvirt,jfehlig/libvirt,libvirt/libvirt,jfehlig/libvirt,nertpinx/libvirt,crobinso/libvirt,jfehlig/libvirt,jardasgit/libvirt,crobinso/libvirt,andreabolognani/libvirt,eskultety/libvirt,olafhering/libvirt,libvirt/libvirt,zippy2/libvirt,olafhering/libvirt,eskultety/libvirt,andreabolognani/libvirt,eskultety/libvirt,andreabolognani/libvirt,nertpinx/libvirt,jardasgit/libvirt,jardasgit/libvirt,nertpinx/libvirt,fabianfreyer/libvirt,eskultety/libvirt,olafhering/libvirt,libvirt/libvirt,crobinso/libvirt,fabianfreyer/libvirt,zippy2/libvirt,nertpinx/libvirt,jardasgit/libvirt,olafhering/libvirt