File workaround-null-object.patch of Package libqt5-qtwayland

From: Fabian Vogt <fabian@ritter-vogt.de>
Subject: Work around crash in QtWaylandClient::QWaylandEglWindow::updateSurface
References: kde#381630

object() is nullptr when it crashes, so do not try to reference it.
This is only a workaround as object() should never be nullptr AFAICT.
So far I haven't discovered any bad side effects.

Index: qtwayland-opensource-src-5.9.1/src/hardwareintegration/client/wayland-egl/qwaylandeglwindow.cpp
===================================================================
--- qtwayland-opensource-src-5.9.1.orig/src/hardwareintegration/client/wayland-egl/qwaylandeglwindow.cpp
+++ qtwayland-opensource-src-5.9.1/src/hardwareintegration/client/wayland-egl/qwaylandeglwindow.cpp
@@ -112,7 +112,7 @@ void QWaylandEglWindow::updateSurface(bo
     // mesa's egl returns NULL if we try to create a, invalid wl_egl_window, however not all EGL
     // implementations may do that, so check the size ourself. Besides, we must deal with resizing
     // a valid window to 0x0, which would make it invalid. Hence, destroy it.
-    if (sizeWithMargins.isEmpty()) {
+    if (sizeWithMargins.isEmpty() || !object()) {
         if (m_eglSurface) {
             eglDestroySurface(m_clientBufferIntegration->eglDisplay(), m_eglSurface);
             m_eglSurface = 0;