RDMA/efa: Use the correct current and new states in modify QP

RDMA/efa: Use the correct current and new states in modify QP

The local variables cur_state and new_state hold the state that should be
used for the modify QP operation instead of the ones in the ib_qp_attr
struct.

Fixes: 40909f664d27 ("RDMA/efa: Add EFA verbs implementation")
Link: https://lore.kernel.org/r/20201201091724.37016-1-galpress@amazon.com
Reviewed-by: Firas JahJah <firasj@amazon.com>
Reviewed-by: Yossi Leybovich <sleybo@amazon.com>
Signed-off-by: Gal Pressman <galpress@amazon.com>
Signed-off-by: Jason Gunthorpe <jgg@nvidia.com>