Unhandled overflow in int8 SVDF evaluation

[VictorDominguite]

When calculating the values to be inserted in the SVDF operator’s activation state in the svdf_common.cc file, there seems to be an error while handling overflow.
In line 111 the value for the dot_prod variable is limited to the interval of valid int8 values, [-128, 127]. But then, in line 115, the activation state’s zero point is added to dot_prod, which may lead to an unhandled overflow.