i2c-amd8111: Missed cleanup

I missed one cleanup in my previous patch.
Signed-off-by: NJean Delvare <khali@linux-fr.org>

drivers/i2c/busses/i2c-amd8111.c

@@ -254,7 +254,8 @@ static s32 amd8111_access(struct i2c_adapter * adap, u16 addr,
 			break;
 
 		case I2C_SMBUS_BLOCK_PROC_CALL:
-			len = min_t(u8, data->block[0], 31);
+			len = min_t(u8, data->block[0],
+				    I2C_SMBUS_BLOCK_MAX - 1);
 			amd_ec_write(smbus, AMD_SMB_CMD, command);
 			amd_ec_write(smbus, AMD_SMB_BCNT, len);
 			for (i = 0; i < len; i++)