rust: phy: use VTABLE_DEFAULT_ERROR

Since 6.8-rc1, using VTABLE_DEFAULT_ERROR for optional functions
(never called) in #[vtable] is the recommended way.

Note that no functional changes in this patch.
Signed-off-by: FUJITA Tomonori <fujita.tomonori@gmail.com>
Reviewed-by: Trevor Gross <tmgross@umich.edu>
Signed-off-by: David S. Miller <davem@davemloft.net>

rust/kernel/net/phy.rs

@@ -580,12 +580,12 @@ pub trait Driver {
 
     /// Issues a PHY software reset.
     fn soft_reset(_dev: &mut Device) -> Result {
-        Err(code::ENOTSUPP)
+        kernel::build_error(VTABLE_DEFAULT_ERROR)
     }
 
     /// Probes the hardware to determine what abilities it has.
     fn get_features(_dev: &mut Device) -> Result {
-        Err(code::ENOTSUPP)
+        kernel::build_error(VTABLE_DEFAULT_ERROR)
     }
 
     /// Returns true if this is a suitable driver for the given phydev.
@@ -597,32 +597,32 @@ fn match_phy_device(_dev: &Device) -> bool {
     /// Configures the advertisement and resets auto-negotiation
     /// if auto-negotiation is enabled.
     fn config_aneg(_dev: &mut Device) -> Result {
-        Err(code::ENOTSUPP)
+        kernel::build_error(VTABLE_DEFAULT_ERROR)
     }
 
     /// Determines the negotiated speed and duplex.
     fn read_status(_dev: &mut Device) -> Result<u16> {
-        Err(code::ENOTSUPP)
+        kernel::build_error(VTABLE_DEFAULT_ERROR)
     }
 
     /// Suspends the hardware, saving state if needed.
     fn suspend(_dev: &mut Device) -> Result {
-        Err(code::ENOTSUPP)
+        kernel::build_error(VTABLE_DEFAULT_ERROR)
     }
 
     /// Resumes the hardware, restoring state if needed.
     fn resume(_dev: &mut Device) -> Result {
-        Err(code::ENOTSUPP)
+        kernel::build_error(VTABLE_DEFAULT_ERROR)
     }
 
     /// Overrides the default MMD read function for reading a MMD register.
     fn read_mmd(_dev: &mut Device, _devnum: u8, _regnum: u16) -> Result<u16> {
-        Err(code::ENOTSUPP)
+        kernel::build_error(VTABLE_DEFAULT_ERROR)
     }
 
     /// Overrides the default MMD write function for writing a MMD register.
     fn write_mmd(_dev: &mut Device, _devnum: u8, _regnum: u16, _val: u16) -> Result {
-        Err(code::ENOTSUPP)
+        kernel::build_error(VTABLE_DEFAULT_ERROR)
     }
 
     /// Callback for notification of link change.