spi: don't unoptimize message in spi_async()

Vulnerability Description

In the Linux kernel, the following vulnerability has been resolved: spi: don't unoptimize message in spi_async() Calling spi_maybe_unoptimize_message() in spi_async() is wrong because the message is likely to be in the queue and not transferred yet. This can corrupt the message while it is being used by the controller driver. spi_maybe_unoptimize_message() is already called in the correct place in spi_finalize_current_message() to balance the call to spi_maybe_optimize_message() in spi_async().

References

• https://git.kernel.org/stable/c/8b9af6d67517ce4a0015928b3cf35bfd2b1bc1c2
• https://git.kernel.org/stable/c/c86a918b1bdba78fb155184f8d88dfba1e63335d