Fix "Dead write" in quic_packet_creator_test.cc

PiperOrigin-RevId: 486223163

quiche/quic/core/quic_packet_creator_test.cc

diff --git a/quiche/quic/core/quic_packet_creator_test.cc b/quiche/quic/core/quic_packet_creator_test.cc
index b3a5b85..1375059 100644
--- a/quiche/quic/core/quic_packet_creator_test.cc
+++ b/quiche/quic/core/quic_packet_creator_test.cc
@@ -3885,7 +3885,7 @@
   ASSERT_FALSE(packets_[0].nonretransmittable_frames.empty());
   QuicFrame padding = packets_[0].nonretransmittable_frames[0];
   // Verify stream frame expansion is excluded.
-  padding.padding_frame.num_padding_bytes = 3;
+  EXPECT_EQ(3, padding.padding_frame.num_padding_bytes);
 }
 
 TEST_F(QuicPacketCreatorMultiplePacketsTest,