[pim/kalarm/release/26.08] src: Fix NODISCARD warning

Git commit 0e1466e2648f3404c1d8c66910af4224bc2e42eb by David Jarvie.
Committed on 07/08/2026 at 19:30.
Pushed by djarvie into branch 'release/26.08'.

Fix NODISCARD warning

M  +3    -3    src/messagedisplayhelper.cpp

https://invent.kde.org/pim/kalarm/-/commit/0e1466e2648f3404c1d8c66910af4224bc2e42eb

diff --git a/src/messagedisplayhelper.cpp b/src/messagedisplayhelper.cpp
index 8c96a79e0..403d11236 100644
--- a/src/messagedisplayhelper.cpp
+++ b/src/messagedisplayhelper.cpp
@@ -1,7 +1,7 @@
 /*
  *  messagedisplayhelper.cpp  -  helper class to display an alarm or error message
  *  Program:  kalarm
- *  SPDX-FileCopyrightText: 2001-2025 David Jarvie <[email protected]>
+ *  SPDX-FileCopyrightText: 2001-2026 David Jarvie <[email protected]>
  *
  *  SPDX-License-Identifier: GPL-2.0-or-later
  */
@@ -264,8 +264,8 @@ void MessageDisplayHelper::initTexts()
                             case File::Type::TextFormatted:
                                 delete mTempFile;
                                 mTempFile = new QTemporaryFile;
-                                mTempFile->open();
-                                mTempFile->write(data);
+                                if (mTempFile->open())
+                                    mTempFile->write(data);
                                 break;
                             default:
                                 break;