Fix leak of objects when reconnecting to QEMU instances
    
    The 'error' cleanup block in qemuProcessReconnect() had a
    'return' statement in the middle of it. This caused a leak
    of virConnectPtr & virQEMUDriverConfigPtr instances. This
    was identified because netcf recently started checking its
    refcount in libvirtd shutdown:
    
    netcfStateCleanup:109 : internal error: Attempt to close netcf state driver with open connections
    
    Signed-off-by: Daniel P. Berrange <berrange@redhat.com>