Add a missing call to srp_remove_host() in srp_remove_one() so that we 
don't leak SRP transport class list entries.
Tested-by: NDavid Dillow <dillowda@ornl.gov>
Acked-by: NFUJITA Tomonori <tomof@acm.org>
Signed-off-by: NRoland Dreier <rolandd@cisco.com>