CBQE-0: minor fix in cbrecover_multiple_failover_swapout_reb_routine

Change-Id: I01b1ba1d1949ae1cf76834207da14f2586a6760d
Reviewed-on: http://review.couchbase.org/32801
Reviewed-by: Andrei Baranouski <andrei.baranouski@gmail.com>
Tested-by: Andrei Baranouski <andrei.baranouski@gmail.com>