Initialize buffer in test before adding it to a packet

net/quic/core/quic_packet_generator_test.cc

Index: net/quic/core/quic_packet_generator_test.cc
diff --git a/net/quic/core/quic_packet_generator_test.cc b/net/quic/core/quic_packet_generator_test.cc
index 990888359cf57e9d911b52bc40b908112f3ab15a..b7b4c7e78b4e167441026697bb2339ffd38ce6e3 100644
--- a/net/quic/core/quic_packet_generator_test.cc
+++ b/net/quic/core/quic_packet_generator_test.cc
@@ -852,7 +852,7 @@ TEST_F(QuicPacketGeneratorTest, ConnectionCloseFrameLargerThanPacketSize) {
   delegate_.SetCanWriteAnything();
   QuicConnectionCloseFrame* frame = new QuicConnectionCloseFrame();
   frame->error_code = QUIC_PACKET_WRITE_ERROR;
-  char buf[2000];
+  char buf[2000] = {};
   QuicStringPiece error_details(buf, 2000);
   frame->error_details = error_details.as_string();
   EXPECT_CALL(delegate_,