Avoid use-after-free in QXcbConnection::initializeScreens()

Origin: upstream, https://code.qt.io/cgit/qt/qtbase.git/commit/?id=86b8c5c3f32c2457
Last-Update: 2020-11-23

Gbp-Pq: Name xcb_screens_uaf.patch

qtbase-opensource-src (5.15.2+dfsg-15) unstable; urgency=medium

  * Backport upstream changes to improve support for OpenSSL 3.0.
    - Don't hardcode libssl version in Depends, fill it dynamically.
  * Replace -ffile-prefix-map in qmodule.pri.
  * Backport upstream patch to make QProcess not search for executables in
    CWD unless explicitly told so (CVE-2022-25255).
  * Update some Lintian overrides.

[dgit import unpatched qtbase-opensource-src 5.15.2+dfsg-15]

Import qtbase-opensource-src_5.15.2+dfsg-15.debian.tar.xz

[dgit import tarball qtbase-opensource-src 5.15.2+dfsg-15 qtbase-opensource-src_5.15.2+dfsg-15.debian.tar.xz]

Import qtbase-opensource-src_5.15.2+dfsg.orig.tar.xz

[dgit import orig qtbase-opensource-src_5.15.2+dfsg.orig.tar.xz]