Make sure we correctly construct underlying base platform theme

When the base platform theme is not set to a null pointer, then we might
assume it has been already constructed and later on try to access an
invalid address which will cause a crash.

Pick-to: 5.15
Change-Id: I6187336bca527e1feeb0902bcfb16f2fbec86d24
Reviewed-by: Thiago Macieira <thiago.macieira@intel.com>

1 files changed, 1 insertions, 1 deletions

diff --git a/src/plugins/platformthemes/xdgdesktopportal/qxdgdesktopportaltheme.cpp b/src/plugins/platformthemes/xdgdesktopportal/qxdgdesktopportaltheme.cpp
index 30c43b67dc..fb324afbd8 100644
--- a/src/plugins/platformthemes/xdgdesktopportal/qxdgdesktopportaltheme.cpp
+++ b/src/plugins/platformthemes/xdgdesktopportal/qxdgdesktopportaltheme.cpp
@@ -65,7 +65,7 @@ public:
         delete baseTheme;
     }
 
-    QPlatformTheme *baseTheme;
+    QPlatformTheme *baseTheme = nullptr;
     uint fileChooserPortalVersion = 0;
 };