[LyX/master] Fix memory leak

[Yuriy Skalko]

commit b3be47765b69ab3a8f4edd18f9851c8281cceb6f
Author: Yuriy Skalko <yuriy.skalko at gmail.com>
Date:   Tue Nov 24 19:58:24 2020 +0200

    Fix memory leak
---
 src/frontends/qt/GuiAbout.cpp |    6 ++++++
 src/frontends/qt/GuiAbout.h   |    1 +
 2 files changed, 7 insertions(+), 0 deletions(-)

diff --git a/src/frontends/qt/GuiAbout.cpp b/src/frontends/qt/GuiAbout.cpp
index f3e58e2..a76b087 100644
--- a/src/frontends/qt/GuiAbout.cpp
+++ b/src/frontends/qt/GuiAbout.cpp
@@ -343,6 +343,12 @@ GuiAbout::GuiAbout(GuiView & lv)
 }
 
 
+GuiAbout::~GuiAbout()
+{
+	delete d;
+}
+
+
 void GuiAbout::on_buttonBox_rejected()
 {
 	close();
diff --git a/src/frontends/qt/GuiAbout.h b/src/frontends/qt/GuiAbout.h
index 3fa8d5b..c9b2443 100644
--- a/src/frontends/qt/GuiAbout.h
+++ b/src/frontends/qt/GuiAbout.h
@@ -24,6 +24,7 @@ class GuiAbout : public DialogView
 public:
 	// Constructor
 	GuiAbout(GuiView & lv);
+	~GuiAbout();
 
 private Q_SLOTS:
 	void on_buttonBox_rejected();