Stub functions in header files need to be static, or we can have
multiple definitions errors.

Reported-by: kbuild test robot <fengguang...@intel.com>
Fixes: 6335e9f2446b ("net: dsa: mv88e6xxx: mv88e6390X SERDES support")
Signed-off-by: Andrew Lunn <and...@lunn.ch>
---
 drivers/net/dsa/mv88e6xxx/global2.h | 6 +++---
 1 file changed, 3 insertions(+), 3 deletions(-)

diff --git a/drivers/net/dsa/mv88e6xxx/global2.h 
b/drivers/net/dsa/mv88e6xxx/global2.h
index 96046bb12ca1..d8d3c5abb2a1 100644
--- a/drivers/net/dsa/mv88e6xxx/global2.h
+++ b/drivers/net/dsa/mv88e6xxx/global2.h
@@ -114,13 +114,13 @@ static inline int mv88e6xxx_g2_set_eeprom16(struct 
mv88e6xxx_chip *chip,
        return -EOPNOTSUPP;
 }
 
-int mv88e6xxx_g2_pvt_write(struct mv88e6xxx_chip *chip, int src_dev,
-                          int src_port, u16 data)
+static int mv88e6xxx_g2_pvt_write(struct mv88e6xxx_chip *chip, int src_dev,
+                                 int src_port, u16 data)
 {
        return -EOPNOTSUPP;
 }
 
-int mv88e6xxx_g2_misc_4_bit_port(struct mv88e6xxx_chip *chip)
+static int mv88e6xxx_g2_misc_4_bit_port(struct mv88e6xxx_chip *chip)
 {
        return -EOPNOTSUPP;
 }
-- 
2.11.0

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