i2c-amd8111: Missed cleanup

I missed one cleanup in my previous patch.

Signed-off-by: Jean Delvare <khali@linux-fr.org>
diff --git a/drivers/i2c/busses/i2c-amd8111.c b/drivers/i2c/busses/i2c-amd8111.c
index e15f9e3..0c70f82 100644
--- a/drivers/i2c/busses/i2c-amd8111.c
+++ b/drivers/i2c/busses/i2c-amd8111.c
@@ -254,7 +254,8 @@
 			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++)