Handle next segment wraparound gracefully

Since global overflow/wraparound sanitization is enabled,
mNextSegSmp can wraparound 32 bits and abort.
In this case, we clamp to UINT_MAX to handle this condition
gracefully. We already use this value as a signal to not
transition to a new segment of tone generation.

Test: Compiles
Bug: 229549191
Change-Id: I2e937e3ea2c43f0f021c48d8ad5cebf2416c5a74