Merge pull request git-for-windows#1914 from benpeart/free-fscache-after-add-gfw

At the end of the add command, disable and free the fscache

Author: dscho

builtin/add.c

@@ -615,6 +615,7 @@ int cmd_add(int argc, const char **argv, const char *prefix)
 			       COMMIT_LOCK | SKIP_IF_UNCHANGED))
 		die(_("Unable to write new index file"));
 
+	enable_fscache(0);
 	UNLEAK(pathspec);
 	UNLEAK(dir);
 	return exit_status;