Error in s_server when -rev option is used with dtls.

Reviewed-by: Matt Caswell <matt@openssl.org>
Reviewed-by: Tomas Mraz <tomas@openssl.org>
(Merged from #23278)

(cherry picked from commit 575117e)

apps/s_server.c

@@ -1714,6 +1714,11 @@ int s_server_main(int argc, char *argv[])
         BIO_printf(bio_err, "Can only use -listen with DTLS\n");
         goto end;
     }
+
+    if (rev && socket_type == SOCK_DGRAM) {
+        BIO_printf(bio_err, "Can't use -rev with DTLS\n");
+        goto end;
+    }
 #endif
 
     if (tfo && socket_type != SOCK_STREAM) {