[PATCH] I2C: Drop the I2C_ACK_TEST ioctl

Drop the I2C_ACK_TEST ioctl, which was commented out. It never really
existed (not after 1999 anyway), and there is no such thing as a ack
test on I2C/SMBus anyway.
Signed-off-by: NJean Delvare <khali@linux-fr.org>
Signed-off-by: NGreg Kroah-Hartman <gregkh@suse.de>

include/linux/i2c.h

@@ -508,9 +508,6 @@ union i2c_smbus_data {
 #define I2C_FUNCS	0x0705	/* Get the adapter functionality */
 #define I2C_RDWR	0x0707	/* Combined R/W transfer (one stop only)*/
 #define I2C_PEC		0x0708	/* != 0 for SMBus PEC                   */
-#if 0
-#define I2C_ACK_TEST	0x0710	/* See if a slave is at a specific address */
-#endif
 
 #define I2C_SMBUS	0x0720	/* SMBus-level access */