CVE-2025-68773 spi: fsl-cpm: Check length parity before switching to 16 bit mode

In the Linux kernel, the following vulnerability has been resolved: spi: fsl-cpm: Check length parity before switching to 16 bit mode Commit fc96ec826bce "spi: fsl-cpm: Use 16 bit mode for large transfers with even size" failed to make sure that the size is really even before switching to 16 bit...