Fix fd leak in VAAPI KMSDRM codepath

app/streaming/video/ffmpeg-renderers/vaapi.cpp

@@ -161,6 +161,9 @@ VAAPIRenderer::openDisplay(SDL_Window* window)
                                  errno);
                     return nullptr;
                 }
+                // This FD is owned by us (not shared with SDL), so it must be
+                // closed when we're done with it or adopted into m_DrmFd.
+                mustCloseFd = true;
             }
 
             // If the KMSDRM FD is not a render node FD, open the render node for libva to use.