Getting clean diff data from git-mailinfo

Hello:

Git-mailinfo is a handy utility to quickly parse the contents of a message containing a patch. However, I'm curious why there isn't a way to get just the diff data, without all the surrounding junk. E.g.:

curl https://lore.kernel.org/driverdev-devel/20200221123817.16643-1-ajay.kathat@microchip.com/raw  \
  | git mailinfo msg patch > info

The contents of "msg" are already munged to reduce it to exactly what would be in the commit message (properly processing the extra From: header), but the contents of "patch" contain all the junk from around the diff, like the diffstat, git version info, and the list trailer.

Is there a git-native command to further clean up the "patch" file to get just diff contents (i.e. as returned by "git diff" after this patch is applied)?

-K