mlx5: Fix parameter type of health_handler_t

This deals with the sparse warning:

    drivers/net/ethernet/mellanox/mlx5/core/health.c:94:54: warning: incorrect type in argument 2 (different address spaces)
    drivers/net/ethernet/mellanox/mlx5/core/health.c:94:54:    expected void *buf
    drivers/net/ethernet/mellanox/mlx5/core/health.c:94:54:    got struct health_buffer [noderef] <asn:2>*health
Signed-off-by: Roland Dreier <roland@purestorage.com>

include/linux/mlx5/driver.h

@@ -729,7 +729,7 @@ void mlx5_cq_debugfs_cleanup(struct mlx5_core_dev *dev);
 int mlx5_db_alloc(struct mlx5_core_dev *dev, struct mlx5_db *db);
 void mlx5_db_free(struct mlx5_core_dev *dev, struct mlx5_db *db);
 
-typedef void (*health_handler_t)(struct pci_dev *pdev, void *buf, int size);
+typedef void (*health_handler_t)(struct pci_dev *pdev, struct health_buffer __iomem *buf, int size);
 int mlx5_register_health_report_handler(health_handler_t handler);
 void mlx5_unregister_health_report_handler(void);
 const char *mlx5_command_str(int command);