Mail: fixed the duplicate listen address detection.

src/mail/ngx_mail_core_module.c

diff --git a/src/mail/ngx_mail_core_module.c b/src/mail/ngx_mail_core_module.c
index a5388c8..05a47f5 100644
--- a/src/mail/ngx_mail_core_module.c
+++ b/src/mail/ngx_mail_core_module.c
@@ -336,7 +336,7 @@
             off = offsetof(struct sockaddr_in6, sin6_addr);
             len = 16;
             sin6 = (struct sockaddr_in6 *) sa;
-            port = sin6->sin6_port;
+            port = ntohs(sin6->sin6_port);
             break;
 #endif
 
@@ -352,7 +352,7 @@
             off = offsetof(struct sockaddr_in, sin_addr);
             len = 4;
             sin = (struct sockaddr_in *) sa;
-            port = sin->sin_port;
+            port = ntohs(sin->sin_port);
             break;
         }