Fix error reporting for socket write failure

runtime/bin/socket_impl.dart

Index: runtime/bin/socket_impl.dart
diff --git a/runtime/bin/socket_impl.dart b/runtime/bin/socket_impl.dart
index b52f3024ea5a0f14b2f6079bd9833a828686b4a1..139344e7b35a5747edc5e6388a2b9ffd4c7d4d56 100644
--- a/runtime/bin/socket_impl.dart
+++ b/runtime/bin/socket_impl.dart
@@ -429,10 +429,10 @@ class _Socket extends _SocketBase implements Socket {
       }
       var result = _writeList(outBuffer, outOffset, bytes);
       if (result is OSError) {
+        _reportError(result, "Write failed");
         // If writing fails we return 0 as the number of bytes and
         // report the error on the error handler.
         result = 0;
-        _reportError(result, "Write failed");
       }
       return result;
     }