net/mlx5: remove unused calculation in RSS expansion

The RSS flow expansion get a memory buffer to fill the new patterns of
the expanded flows.
This memory management saves the next address to write into the buffer
in a dedicated variable.

The calculation for the next address was wrongly also done when all the
patterns were ready.

Remove it.

Fixes: 4ed05fcd44 ("ethdev: add flow API to expand RSS flows")
Cc: stable@dpdk.org

Signed-off-by: Michael Baum <michaelba@nvidia.com>
Acked-by: Matan Azrad <matan@nvidia.com>

drivers/net/mlx5/mlx5_flow.c

@@ -379,8 +379,6 @@ mlx5_flow_expand_rss(struct mlx5_flow_expand_rss *buf, size_t size,
 				   user_pattern_size);
 			addr = (void *)(((uintptr_t)addr) + user_pattern_size);
 			rte_memcpy(addr, flow_items, elt * sizeof(*item));
-			addr = (void *)(((uintptr_t)addr) +
-					elt * sizeof(*item));
 		}
 	}
 	return lsize;