6372aaa608
shader_fade_and_move_horiz_out writes a complete stride at the end of its dframe data This led to SIGSEGV since the stride reached into sframe->map[0]->memory which could not be umpapped later on. This is due to `d` is increased twice. Once at the end of the upper loop and at the start of the lower loop. The corresponding dframe stride is therefore skipped. Rewind `d` and start at the correct position. Fixes https://gitlab.freedesktop.org/gstreamer/gst-plugins-bad/-/issues/1702 Part-of: <https://gitlab.freedesktop.org/gstreamer/gstreamer/-/merge_requests/1751>