Resolver: fixed possible segmentation fault on DNS format error.

src/core/ngx_resolver.c

diff --git a/src/core/ngx_resolver.c b/src/core/ngx_resolver.c
index 7013885..14bd2b3 100644
--- a/src/core/ngx_resolver.c
+++ b/src/core/ngx_resolver.c
@@ -1312,7 +1312,7 @@
         times = 0;
 
         for (q = ngx_queue_head(&r->name_resend_queue);
-             q != ngx_queue_sentinel(&r->name_resend_queue) || times++ < 100;
+             q != ngx_queue_sentinel(&r->name_resend_queue) && times++ < 100;
              q = ngx_queue_next(q))
         {
             rn = ngx_queue_data(q, ngx_resolver_node_t, queue);