Syslog: fixed message sending on win32.

src/core/ngx_syslog.c

diff --git a/src/core/ngx_syslog.c b/src/core/ngx_syslog.c
index 7c5de38..e6d40f4 100644
--- a/src/core/ngx_syslog.c
+++ b/src/core/ngx_syslog.c
@@ -317,6 +317,10 @@
     cln->handler = ngx_syslog_cleanup;
 
     peer->conn.fd = fd;
+
+    /* UDP sockets are always ready to write */
+    peer->conn.write->ready = 1;
+
     return NGX_OK;
 
 failed: