stream_wrap: fix long line introduced in da5ad92

Said commit was a back-port from a feature branch where it did lint.
Mea culpa.

src/stream_wrap.cc

@@ -305,7 +305,8 @@ void StreamWrap::WriteStringImpl(const FunctionCallbackInfo<Value>& args) {
       req_wrap->object()->Set(handle_sym, send_handle_obj);
     }
 
-    err = wrap->callbacks()->DoWrite(req_wrap,
+    err = wrap->callbacks()->DoWrite(
+        req_wrap,
         &buf,
         1,
         reinterpret_cast<uv_stream_t*>(send_handle),