git-init-db: brown paper bag bugfix.

OK, I admit I am an idiot.  I ended up creating bunch of garbage
directories like .git/HEADbranch/ .git/HEADrefs/...
Signed-off-by: NJunio C Hamano <junkio@cox.net>

init-db.c

@@ -189,6 +189,7 @@ static void create_default_files(const char *git_dir)
 			exit(1);
 		}
 	}
+	path[len] = 0;
 	copy_templates(path);
 }