MINOR: server state: missing LF (\n) on error message printed when parsing server state file

There is no LF characters printed at the end of the error message
returned by the function when applying server state found in a file.
diff --git a/src/server.c b/src/server.c
index a76ca6b..f465e16 100644
--- a/src/server.c
+++ b/src/server.c
@@ -2167,9 +2167,11 @@
 	}
 
  out:
-	if (msg->len)
+	if (msg->len) {
+		chunk_appendf(msg, "\n");
 		Warning("server-state application failed for server '%s/%s'%s",
 		        srv->proxy->id, srv->id, msg->str);
+	}
 }
 
 /* This function parses all the proxies and only take care of the backends (since we're looking for server)