ucc_geth: really fix section mismatch

Commit ed7e63a51d46e835422d89c687b8a3e419a4212a has tried to fix
section mismatch:

WARNING: vmlinux.o(.init.text+0x17278): Section mismatch: reference to
.exit.text:uec_mdio_exit (between 'ucc_geth_init' and 'uec_mdio_init')

But that mismatch still happens.

This patch actually fixing section mismatch by removing __exit from
the header file.

Signed-off-by: Anton Vorontsov <[e-mail]>
Signed-off-by: Jeff Garzik <[e-mail]>

drivers/net/ucc_geth_mii.h

···
 int uec_mdio_read(struct mii_bus *bus, int mii_id, int regnum);
 int uec_mdio_write(struct mii_bus *bus, int mii_id, int regnum, u16 value);
 int __init uec_mdio_init(void);
-void __exit uec_mdio_exit(void);
+void uec_mdio_exit(void);
 #endif				/* __UEC_MII_H */