Add mistatch->mismatch

This mispelling was recently fixed in Linux:
https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=3a57a643a851dbb1c4a1819394ca009e3bfa4813

It also occurs in other projects: https://grep.app/search?q=Mistatch
1 file changed