daemon-util: expose notify_push_fd()

It will be used in a later commit.

src/shared/daemon-util.c

@@ -45,7 +45,7 @@ int close_and_notify_warn(int fd, const char *name) {
         return safe_close(fd);
 }
 
-static int notify_push_fd(int fd, const char *name) {
+int notify_push_fd(int fd, const char *name) {
         _cleanup_free_ char *state = NULL;
 
         assert(fd >= 0);

src/shared/daemon-util.h

@@ -25,6 +25,7 @@ static inline void notify_on_cleanup(const char **p) {
 
 int notify_remove_fd_warnf(const char *format, ...) _printf_(1, 2);
 int close_and_notify_warn(int fd, const char *name);
+int notify_push_fd(int fd, const char *name);
 int notify_push_fdf(int fd, const char *format, ...) _printf_(2, 3);
 
 int notify_reloading_full(const char *status);