Also call the low-level driver if ->c_iflag & (IXON|IXOFF|IXANY) changes.
Also call the low-level driver if ->c_iflag & (IXON|IXOFF|IXANY) changes.

Uftdi(4) examines (c_iflag & (IXON|IXOFF)) to control hw XON-XOFF support.
This is obviously no good, if changes to those bits are not communicated
down the stack.

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