libinput: Print qsizetype through %PRIdQSIZETYPE

Otherwise it's wrong where qsizetype is 32bit.

Amends commit 3941fe697b.

Change-Id: If80b01bb188659509c42f950e803de9e1f36400a
Reviewed-by: Giuseppe D'Angelo <giuseppe.dangelo@kdab.com>
(cherry picked from commit f5cad8035d04b7d10d879369d327917c2fef8141)
Reviewed-by: Qt Cherry-pick Bot <cherrypick_bot@qt-project.org>

src/platformsupport/input/libinput/qlibinputtouch.cpp

@@ -70,7 +70,8 @@ static void setMatrix(libinput_device *dev)
             float matrix[6];
             QList<QByteArray> list = env.split(' ');
             if (list.length() != 6) {
-                qCWarning(qLcLibInput, "matrix length %lld wrong, should be 6", list.length());
+                qCWarning(qLcLibInput, "matrix length %" PRIdQSIZETYPE " wrong, should be 6",
+                          list.length());
                 return;
             }
             for (int i = 0; i < 6; i++) {