Update Makefile

[Umeaboy]

No description provided.

[leio]

fwiw, to save git blame time for others - this was added like this in commit dcdd195

[davide125]

The Signed-off-by tag is wrong on this commit (the email doesn't match the commit author one)

[Umeaboy]

Is it OK now with my 2nd commit?

[Umeaboy]

I saw my spelling error. Sorry!!!!!

[davide125]

I recommend using git commit -s instead of adding the tag by hand, that should prevent issues like this. You will also need to squash this to a single commit (e.g. with git rebase and then a force push) or the DCO check won't pass.