ipvs: remove unnecessary assignment in __ip_vs_get_out_rt

It is a precondition of the function that daddr be equal to dest->addr.ip
if dest is non-NULL, so this additional assignment is just confusing for
stupid engineers like me.

Signed-off-by: Alex Gartrell <agartrell@fb.com>
Signed-off-by: Simon Horman <horms@verge.net.au>