fix IPv6 listen socket handling while reconfiguring

src/core/ngx_cycle.c

diff --git a/src/core/ngx_cycle.c b/src/core/ngx_cycle.c
index a4e00b9..5973fbe 100644
--- a/src/core/ngx_cycle.c
+++ b/src/core/ngx_cycle.c
@@ -868,7 +868,7 @@
         sin61 = (struct sockaddr_in6 *) sa1;
         sin62 = (struct sockaddr_in6 *) sa2;
 
-        if (sin61->sin6_port != sin61->sin6_port) {
+        if (sin61->sin6_port != sin62->sin6_port) {
             return NGX_DECLINED;
         }