vbox: fix vboxCapsInit
vbox: fix vboxCapsInit

There is a stray mis-indented 'return NULL' left after a recent
refactor.

Fixes: c18d9e23fafabcfbb80481e0705931036b8e7331
Signed-off-by: Ján Tomko <4cab11cfb98d3c937327354a78eb07dbb6ee2bc6@redhat.com>
Reviewed-by: Kristína Hanicová <e70d889c982bbe3b9ce2841af457ca911bff1baa@redhat.com>

zippy2/libvirt,jfehlig/libvirt,jfehlig/libvirt,zippy2/libvirt,libvirt/libvirt,libvirt/libvirt,olafhering/libvirt,jfehlig/libvirt,jfehlig/libvirt,olafhering/libvirt,crobinso/libvirt,crobinso/libvirt,libvirt/libvirt,crobinso/libvirt,olafhering/libvirt,crobinso/libvirt,zippy2/libvirt,zippy2/libvirt,olafhering/libvirt,libvirt/libvirt