os: Fix siHostnameAddrMatch in the case where h_addr isn't defined

When IPv6 support isn't enabled, and h_addr isn't defined,
there is no for loop, so the break statement is invalid.

Signed-off-by: Joaquim Monteiro <joaquim.monteiro@protonmail.com>
Part-of: <https://gitlab.freedesktop.org/xorg/xserver/-/merge_requests/1572>

os/access.c

@@ -1867,7 +1867,9 @@ siHostnameAddrMatch(int family, void *addr, int len,
                 if ((f == family) && (len == hostaddrlen) &&
                     (memcmp(addr, hostaddr, len) == 0)) {
                     res = TRUE;
+#ifdef h_addr
                     break;
+#endif
                 }
             }
         }