RDMA/mlx5: Init dest_type when create flow

When using action drop dest_type was never assigned to any value.  Add
initialization of dest_type to -1 since 0 is valid.

Fixes: f29de9e ("RDMA/mlx5: Add support for drop action in DV steering")
Link: https://lore.kernel.org/r/20200707110259.882276-1-leon@kernel.org
Signed-off-by: Daria Velikovsky <daria@mellanox.com>
Reviewed-by: Maor Gottlieb <maorg@mellanox.com>
Signed-off-by: Leon Romanovsky <leonro@mellanox.com>
Signed-off-by: Jason Gunthorpe <jgg@nvidia.com>

drivers/infiniband/hw/mlx5/fs.c

@@ -1903,7 +1903,7 @@ static int UVERBS_HANDLER(MLX5_IB_METHOD_CREATE_FLOW)(
 	struct mlx5_flow_context flow_context = {.flow_tag =
 		MLX5_FS_DEFAULT_FLOW_TAG};
 	u32 *offset_attr, offset = 0, counter_id = 0;
-	int dest_id, dest_type, inlen, len, ret, i;
+	int dest_id, dest_type = -1, inlen, len, ret, i;
 	struct mlx5_ib_flow_handler *flow_handler;
 	struct mlx5_ib_flow_matcher *fs_matcher;
 	struct ib_uobject **arr_flow_actions;