h264parse: reassign buffer after gst_h264_parse_handle_sps_pps_nals
buffer point to frame->out_buffer, gst_h264_parse_handle_sps_pps_nals may replace frame->out_buffer, so we need reassign frame->out_buffer to buffer after the function
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buffer point to frame->out_buffer, gst_h264_parse_handle_sps_pps_nals may replace frame->out_buffer, so we need reassign frame->out_buffer to buffer after the function