[BUG] feed_forward_voltage/current can contain random stack/heap garbage

[StijnWoestenborghs]

Describe the bug
FOCMotor.h defines

    DQCurrent_s feed_forward_current;//!< current d and q current measured
    DQVoltage_s feed_forward_voltage;//!< current d and q voltage set to the motor

These variables are never actively set somewhere when not initialized properly to zero.

proposal; initialize to zero

    DQCurrent_s feed_forward_current{0.0f, 0.0f};//!< current d and q current measured
    DQVoltage_s feed_forward_voltage{0.0f, 0.0f};//!< current d and q voltage set to the motor

Describe the hardware setup
For us it is very important to know what is the hardware setup you're using in order to be able to help more directly

• Which motor: https://www.sparkfun.com/three-phase-brushless-gimbal-stabilizer-motor.html
• Which driver: TMC6300
• Which microcontroller: ESP32S3
• Which position sensor: MT6701
• Current sensing used? No

IDE you are using

• Something else: raw ESP_IDF with platformio