r3140, r3144, r3298, r3299, r3300, r3307, r3308 merge: resolver fixes: *) fix memory leak in resolver *) fix resolver cache rbtree comparison *) fix segfault in resolver: ngx_resolve_name_done() and ngx_resolve_addr_done() did not delete contexts from a resolver node waiting list. *) fix "PTR ." case in address resolver *) add quotes in an error message, *) fix resolving an empty name (".") *) use ngx_resolver_alloc() instead of ngx_resolver_calloc() since all fields are filled

--- a/src/mail/ngx_mail_smtp_handler.c
+++ b/src/mail/ngx_mail_smtp_handler.c
@@ -191,7 +191,7 @@ ngx_mail_smtp_resolve_name_handler(ngx_r
 
     if (ctx->state) {
         ngx_log_error(NGX_LOG_ERR, c->log, 0,
-                      "%V could not be resolved (%i: %s)",
+                      "\"%V\" could not be resolved (%i: %s)",
                       &ctx->name, ctx->state,
                       ngx_resolver_strerror(ctx->state));