mlx5: Fix type of mode parameter in mlx5_dpll_device_mode_get()

When building with -Wincompatible-function-pointer-types-strict, a
warning designed to catch potential kCFI failures at build time rather
than run time due to incorrect function pointer types, there is a
warning due to a mismatch between the type of the mode parameter in
mlx5_dpll_device_mode_get() vs. what the function pointer prototype for
->mode_get() in 'struct dpll_device_ops' expects.

  drivers/net/ethernet/mellanox/mlx5/core/dpll.c:141:14: error: incompatible function pointer types initializing 'int (*)(const struct dpll_device *, void *, enum dpll_mode *, struct netlink_ext_ack *)' with an expression of type 'int (const struct dpll_device *, void *, u32 *, struct netlink_ext_ack *)' (aka 'int (const struct dpll_device *, void *, unsigned int *, struct netlink_ext_ack *)') [-Werror,-Wincompatible-function-pointer-types-strict]
    141 |         .mode_get = mlx5_dpll_device_mode_get,
        |                     ^~~~~~~~~~~~~~~~~~~~~~~~~
  1 error generated.

Change the type of the mode parameter in mlx5_dpll_device_mode_get() to
clear up the warning and avoid kCFI failures at run time.

Fixes: 496fd0a2 ("mlx5: Implement SyncE support using DPLL infrastructure")
Signed-off-by: Nathan Chancellor <nathan@kernel.org>
Reviewed-by: Simon Horman <horms@kernel.org>
Link: https://lore.kernel.org/r/20231002-net-wifpts-dpll_mode_get-v1-2-a356a16413cf@kernel.orgSigned-off-by: Jakub Kicinski <kuba@kernel.org>

drivers/net/ethernet/mellanox/mlx5/core/dpll.c

@@ -121,8 +121,8 @@ static int mlx5_dpll_device_lock_status_get(const struct dpll_device *dpll,
 }
 
 static int mlx5_dpll_device_mode_get(const struct dpll_device *dpll,
-				     void *priv,
-				     u32 *mode, struct netlink_ext_ack *extack)
+				     void *priv, enum dpll_mode *mode,
+				     struct netlink_ext_ack *extack)
 {
 	*mode = DPLL_MODE_MANUAL;
 	return 0;