hwmon: (w83627ehf) Use proper exit sequence

According to the datasheet for Winbond W83627DHG the proper way to exit
the Extended Function Mode is to write 0xaa to the EFER(0x2e or 0x4e).
Signed-off-by: NJonas Jonsson <jonas@ludd.ltu.se>
Signed-off-by: NJean Delvare <khali@linux-fr.org>

drivers/hwmon/w83627ehf.c

@@ -127,6 +127,7 @@ superio_enter(int ioreg)
 static inline void
 superio_exit(int ioreg)
 {
+	outb(0xaa, ioreg);
 	outb(0x02, ioreg);
 	outb(0x02, ioreg + 1);
 }