i2c: octeon: check correct size of maximum RECV_LEN packet

I2C_SMBUS_BLOCK_MAX defines already the maximum number as defined in the
SMBus 2.0 specs. No reason to add one to it.

Fixes: 886f6f8 ("i2c: octeon: Support I2C_M_RECV_LEN")
Signed-off-by: Wolfram Sang <wsa+renesas@sang-engineering.com>
Reviewed-by: Robert Richter <rric@kernel.org>
Signed-off-by: Wolfram Sang <wsa@kernel.org>

drivers/i2c/busses/i2c-octeon-core.c

@@ -347,7 +347,7 @@ static int octeon_i2c_read(struct octeon_i2c *i2c, int target,
 		if (result)
 			return result;
 		if (recv_len && i == 0) {
-			if (data[i] > I2C_SMBUS_BLOCK_MAX + 1)
+			if (data[i] > I2C_SMBUS_BLOCK_MAX)
 				return -EPROTO;
 			length += data[i];
 		}