scripts/get_maintainer.pl: warn on missing git or git repository

support older versions of grep (use -E not -P)
no need to return data in routine recent_git_signoffs

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