mjpegdec: stop setting the QP table

MJPEG does not have a single quantiser scale, so this does not fit into
the intended API use.

This removes the last use of the long-deprecated QP table API.

libavcodec/mjpegdec.c

@@ -2606,19 +2606,12 @@ eoi_parser:
 
             frame->pkt_dts = s->pkt->dts;
 
-            if (!s->lossless) {
+            if (!s->lossless && avctx->debug & FF_DEBUG_QP) {
                 int qp = FFMAX3(s->qscale[0],
                                 s->qscale[1],
                                 s->qscale[2]);
-                int qpw = (s->width + 15) / 16;
-                AVBufferRef *qp_table_buf = av_buffer_alloc(qpw);
-                if (qp_table_buf) {
-                    memset(qp_table_buf->data, qp, qpw);
-                    av_frame_set_qp_table(frame, qp_table_buf, 0, FF_QSCALE_TYPE_MPEG1);
-                }
 
-                if(avctx->debug & FF_DEBUG_QP)
-                    av_log(avctx, AV_LOG_DEBUG, "QP: %d\n", qp);
+                av_log(avctx, AV_LOG_DEBUG, "QP: %d\n", qp);
             }
 
             goto the_end;

tests/ref/fate/exif-image-embedded

@@ -29,12 +29,6 @@ color_transfer=unknown
 chroma_location=center
 TAG:UserComment=AppleMark
 
-[SIDE_DATA]
-side_data_type=QP table data
-[/SIDE_DATA]
-[SIDE_DATA]
-side_data_type=QP table properties
-[/SIDE_DATA]
 [/FRAME]
 [FRAME]
 media_type=audio

tests/ref/fate/exif-image-jpg

@@ -229,10 +229,4 @@ TAG:ExposureMode=    0
 TAG:WhiteBalance=    0
 TAG:DigitalZoomRatio=   4000:4000
 TAG:SceneCaptureType=    0
-[SIDE_DATA]
-side_data_type=QP table data
-[/SIDE_DATA]
-[SIDE_DATA]
-side_data_type=QP table properties
-[/SIDE_DATA]
 [/FRAME]