datatypes: removing unnecessary return statement.

There is a wrong 'return' statement after a 'goto' statement inside the
function virConnectCloseCallbackDataRegister(). This commit only removes
the 'return'.

Signed-off-by: Julio Faracco <jcfaracco@gmail.com>

src/datatypes.c

@@ -193,7 +193,6 @@ void virConnectCloseCallbackDataRegister(virConnectCloseCallbackDataPtr closeDat
         VIR_WARN("Attempt to register callback on armed"
                  " close callback object %p", closeData);
         goto cleanup;
-        return;
     }
 
     closeData->conn = virObjectRef(conn);