QString benchmark: fix the [[nodiscard]] warnings

Change-Id: I75941c295ba7d0a9bff5f12b49db28875b97c62a
Reviewed-by: Giuseppe D'Angelo <giuseppe.dangelo@kdab.com>
Reviewed-by: Edward Welbourne <edward.welbourne@qt.io>

1 files changed, 3 insertions, 3 deletions

diff --git a/tests/benchmarks/corelib/text/qstring/main.cpp b/tests/benchmarks/corelib/text/qstring/main.cpp
index 0214931b71..8c37747019 100644
--- a/tests/benchmarks/corelib/text/qstring/main.cpp
+++ b/tests/benchmarks/corelib/text/qstring/main.cpp
@@ -155,7 +155,7 @@ void tst_QString::toUpper()
     QFETCH(QString, s);
 
     QBENCHMARK {
-        s.toUpper();
+        [[maybe_unused]] auto r = s.toUpper();
     }
 }
 
@@ -169,7 +169,7 @@ void tst_QString::toLower()
     QFETCH(QString, s);
 
     QBENCHMARK {
-        s.toLower();
+        [[maybe_unused]] auto r = s.toLower();
     }
 }
 
@@ -183,7 +183,7 @@ void tst_QString::toCaseFolded()
     QFETCH(QString, s);
 
     QBENCHMARK {
-        s.toCaseFolded();
+        [[maybe_unused]] auto r = s.toCaseFolded();
     }
 }