Fix QuicToyClient::SendRequestsAndPrintResponses() in release mode.

QUICHE_DCHECK() does not evaluate its argument in release mode.

PiperOrigin-RevId: 617557773

quiche/quic/tools/quic_toy_client.cc

diff --git a/quiche/quic/tools/quic_toy_client.cc b/quiche/quic/tools/quic_toy_client.cc
index 49afc35..2fae8e5 100644
--- a/quiche/quic/tools/quic_toy_client.cc
+++ b/quiche/quic/tools/quic_toy_client.cc
@@ -431,9 +431,9 @@
   if (!quiche::GetQuicheCommandLineFlag(FLAGS_body_hex).empty()) {
     QUICHE_DCHECK(quiche::GetQuicheCommandLineFlag(FLAGS_body).empty())
         << "Only set one of --body and --body_hex.";
-    QUICHE_DCHECK(absl::HexStringToBytes(
-        quiche::GetQuicheCommandLineFlag(FLAGS_body_hex), &body))
-        << "Failed to parse --body_hex.";
+    const bool success = absl::HexStringToBytes(
+        quiche::GetQuicheCommandLineFlag(FLAGS_body_hex), &body);
+    QUICHE_DCHECK(success) << "Failed to parse --body_hex.";
   }
 
   // Construct a GET or POST request for supplied URL.