fd-util: rename CLOSE_AND_REPLACE() -> close_and_replace()

We have free_and_replace() and friends, they are all named with lower
letters, even they are macros, not functions.
For consistency, let's rename CLOSE_AND_REPLACE() with lower letters.

This also mekes the macro used more places.

src/libsystemd-network/sd-ipv4acd.c

@@ -583,7 +583,7 @@ int sd_ipv4acd_start(sd_ipv4acd *acd, bool reset_conflicts) {
         if (r < 0)
                 return r;
 
-        CLOSE_AND_REPLACE(acd->fd, r);
+        close_and_replace(acd->fd, r);
 
         if (reset_conflicts)
                 acd->n_conflict = 0;