ui/gtk-egl: move function calls back to regular code path

Commit 6f189a0 ("ui/gtk-egl: Check EGLSurface before doing
scanout") introduced a regression when QEMU is running with a
virtio-gpu-gl-device on a host under X11. After the guest has
initialized the virtio-gpu-gl-device, the guest screen only
shows "Display output is not active.".

Commit 6f189a0 moved all function calls in
gd_egl_scanout_texture() to a code path which is only called
once after gd_egl_init() succeeds in gd_egl_scanout_texture().
Move all function calls in gd_egl_scanout_texture() back to
the regular code path so they get always called if one of the
gd_egl_init() calls was successful.

Fixes: 6f189a0 ("ui/gtk-egl: Check EGLSurface before doing scanout")
Signed-off-by: Volker Rümelin <vr_qemu@t-online.de>
Reviewed-by: Marc-André Lureau <marcandre.lureau@redhat.com>
Message-Id: <20231111104020.26183-1-vr_qemu@t-online.de>
(cherry picked from commit 53a939f)
Signed-off-by: Michael Tokarev <mjt@tls.msk.ru>

ui/gtk-egl.c

@@ -239,14 +239,14 @@ void gd_egl_scanout_texture(DisplayChangeListener *dcl,
         if (!vc->gfx.esurface) {
             return;
         }
+    }
 
-        eglMakeCurrent(qemu_egl_display, vc->gfx.esurface,
-                       vc->gfx.esurface, vc->gfx.ectx);
+    eglMakeCurrent(qemu_egl_display, vc->gfx.esurface,
+                   vc->gfx.esurface, vc->gfx.ectx);
 
-        gtk_egl_set_scanout_mode(vc, true);
-        egl_fb_setup_for_tex(&vc->gfx.guest_fb, backing_width, backing_height,
-                             backing_id, false);
-    }
+    gtk_egl_set_scanout_mode(vc, true);
+    egl_fb_setup_for_tex(&vc->gfx.guest_fb, backing_width, backing_height,
+                         backing_id, false);
 }
 
 void gd_egl_scanout_dmabuf(DisplayChangeListener *dcl,