ptp: Fix type of mode parameter in ptp_ocp_dpll_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
ptp_ocp_dpll_mode_get() vs. what the function pointer prototype for
->mode_get() in 'struct dpll_device_ops' expects.

  drivers/ptp/ptp_ocp.c:4353:14: 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]
   4353 |         .mode_get = ptp_ocp_dpll_mode_get,
        |                     ^~~~~~~~~~~~~~~~~~~~~
  1 error generated.

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

Fixes: 09eeb3ae ("ptp_ocp: implement DPLL ops")
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-v1-1-a356a16413cf@kernel.orgSigned-off-by: Jakub Kicinski <kuba@kernel.org>

drivers/ptp/ptp_ocp.c

@@ -4255,7 +4255,7 @@ static int ptp_ocp_dpll_state_get(const struct dpll_pin *pin, void *pin_priv,
 }
 
 static int ptp_ocp_dpll_mode_get(const struct dpll_device *dpll, void *priv,
-				 u32 *mode, struct netlink_ext_ack *extack)
+				 enum dpll_mode *mode, struct netlink_ext_ack *extack)
 {
 	*mode = DPLL_MODE_AUTOMATIC;
 	return 0;