QLocal8Bit::convertFromUnicode[win]: limit fprintf to !NDEBUG

Because there is no other way to stop it from printing the output.

Pick-to: 6.5
Change-Id: Ie6dcb393351f50691366849ba85d60e2e186f9fb
Reviewed-by: Edward Welbourne <[email protected]>
Reviewed-by: Thiago Macieira <[email protected]>
(cherry picked from commit 1dd89bfb04515bd2e431f8915256a417d622288f)
Reviewed-by: Qt Cherry-pick Bot <[email protected]>
(cherry picked from commit d059d5c3cb9dddcc55cf5291cd1b7222169d105b)

1 files changed, 2 insertions, 0 deletions

diff --git a/src/corelib/text/qstringconverter.cpp b/src/corelib/text/qstringconverter.cpp
index 4a60d60ae35..91d58b7c40d 100644
--- a/src/corelib/text/qstringconverter.cpp
+++ b/src/corelib/text/qstringconverter.cpp
@@ -1575,9 +1575,11 @@ QByteArray QLocal8Bit::convertFromUnicode_sys(QStringView in, quint32 codePage,
                     // incomplete sequence, probably a Windows bug. We try to avoid that from
                     // happening by reducing the window size in that case. But let's keep this
                     // branch just in case of other bugs.
+#ifndef QT_NO_DEBUG
                     r = GetLastError();
                     fprintf(stderr,
                             "WideCharToMultiByte: Cannot convert multibyte text (error %d)\n", r);
+#endif // !QT_NO_DEBUG
                     break;
                 }
                 std::tie(out, outlen) = growOut(neededLength);