dev-qt/qtsvg: backport qt6.6 fix for crash with invalid SVGs

Bug: https://bugs.gentoo.org/915582
Signed-off-by: Ionen Wolkens <ionen@gentoo.org>

dev-qt/qtsvg/files/qtsvg-6.6.0-invalid-svg-crash.patch

@@ -0,0 +1,18 @@
+https://bugs.gentoo.org/915582
+https://bugreports.qt.io/browse/QTBUG-117944
+https://codereview.qt-project.org/c/qt/qtsvg/+/510692
+https://github.com/qt/qtsvg/commit/effc44495a33babd4cf7a2044123f420e6b3da1c
+From: Paul Olav Tvete <paul.tvete@qt.io>
+Date: Tue, 10 Oct 2023 10:14:22 +0200
+Subject: [PATCH] Fix nullptr dereference with invalid SVG
+--- a/src/svg/qsvghandler.cpp
++++ b/src/svg/qsvghandler.cpp
+@@ -3606,6 +3606,8 @@ void QSvgHandler::init()
+ 
+ static bool detectCycles(const QSvgNode *node, QList<const QSvgUse *> active = {})
+ {
++    if (Q_UNLIKELY(!node))
++        return false;
+     switch (node->type()) {
+     case QSvgNode::DOC:
+     case QSvgNode::G:

dev-qt/qtsvg/qtsvg-6.6.0-r1.ebuild

@@ -16,3 +16,7 @@ RDEPEND="
 	sys-libs/zlib:=
 "
 DEPEND="${RDEPEND}"
+
+PATCHES=(
+	"${FILESDIR}"/${P}-invalid-svg-crash.patch
+)