RDMA/core: Free DIM memory in error unwind

RDMA/core: Free DIM memory in error unwind

[ Upstream commit fb448ce87a4a9482b084e67faf804aec79ed9b43 ]

The memory allocated for the DIM wasn't freed in in error unwind path, fix
it by calling to rdma_dim_destroy().

Fixes: da6629793aa6 ("RDMA/core: Provide RDMA DIM support for ULPs")
Link: https://lore.kernel.org/r/20200730082719.1582397-4-leon@kernel.org
Signed-off-by: Leon Romanovsky <leonro@mellanox.com>
Reviewed-by: Max Gurtovoy <maxg@mellanox.com <mailto:maxg@mellanox.com>>
Signed-off-by: Jason Gunthorpe <jgg@nvidia.com>
Signed-off-by: Sasha Levin <sashal@kernel.org>