Enable disabled interrupt, on unsuccessful operation.

Found by Coccinelle.
Signed-off-by: NTapasweni Pathak <tapaswenipathak@gmail.com>
Acked-by: NJulia Lawall <julia.lawall@lip6.fr>
Reviewed-by: NJames Hogan <james.hogan@imgtec.com>
Signed-off-by: NMarcelo Tosatti <mtosatti@redhat.com>