RDMA/cxgb4: Delete unused c4iw_ep_redirect prototype

c4iw_ep_redirect() doesn't exist.

Signed-off-by: Alexey Dobriyan <adobriyan@gmail.com>
Link: https://lore.kernel.org/r/a67881e7-469b-43d9-9973-ad7579eb2c4b@p183


Signed-off-by: Leon Romanovsky <leon@kernel.org>