scripts/get_maintainer.pl: fix mailmap handling

Implement it, like it is described in git-shortlog.

Signed-off-by: Florian Mickler <[email protected]>
Signed-off-by: Joe Perches <[email protected]>
Signed-off-by: Andrew Morton <[email protected]>
Signed-off-by: Linus Torvalds <[email protected]>
1 file changed