git.sh: remove previous tmprepo if args>5

if doing a retry, the directory may still exist, which
would make git clone yield an error response; the existing
directory will have been the one that failed to reset, so
let's delete it.

the one deleted is not the cache (repo/PROJECT/), thus
otherwise maintaining current behaviour.

Signed-off-by: Leah Rowe <leah@libreboot.org>

include/git.sh

@@ -100,6 +100,7 @@ fetch_submodule()
 
 tmpclone()
 {
+	[ $# -lt 6 ] || rm -Rf "$3" || $err "git retry: !rm $3 ($1)"
 	repodir="repo/${1##*/}" && [ $# -gt 5 ] && repodir="$3"
 	x_ mkdir -p "repo"
 	if [ -d "$repodir" ] && [ $# -lt 6 ]; then