ntpd: fix refid reported in server mode, closes 13056

function                                             old     new   delta
resolve_peer_hostname                                129     196     +67
recv_and_process_peer_pkt                           2475    2476      +1
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(add/remove: 0/0 grow/shrink: 2/0 up/down: 68/0)               Total: 68 bytes

Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>
diff --git a/mailutils/popmaildir.c b/mailutils/popmaildir.c
index 6927e3a..c5522f1 100644
--- a/mailutils/popmaildir.c
+++ b/mailutils/popmaildir.c
@@ -156,7 +156,7 @@
 				md5_ctx_t ctx;
 				char hex[16 * 2 + 1];
 			} md5;
-			uint32_t res[16 / 4];
+			uint32_t res[MD5_OUTSIZE / 4];
 
 			char *s = strchr(buf, '>');
 			if (s)