net/mlx5: Fix static checker warning on steering tracepoints code

Fix this sparse complaint:

drivers/net/ethernet/mellanox/mlx5/core/./diag/fs_tracepoint.h:172:1:
	warning: odd constant _Bool cast (ffffffffffffffff becomes 1)

Fixes: d9fea79171ee ('net/mlx5: Add tracepoints')
Signed-off-by: Matan Barak <matanb@mellanox.com>
Reviewed-by: Or Gerlitz <ogerlitz@mellanox.com>
Signed-off-by: Saeed Mahameed <saeedm@mellanox.com>