avcodec/dvdec: Fix "left shift of negative value -254"

Fixes: dvdec_left_shift.avi
Found-by: Piotr Bandurski <ami_stuff@o2.pl>
Signed-off-by: Michael Niedermayer <michael@niedermayer.cc>
(cherry picked from commit 93ac72a9)
Signed-off-by: Michael Niedermayer <michael@niedermayer.cc>

libavcodec/dvdec.c

@@ -333,7 +333,7 @@ static int dv_decode_video_segment(AVCodecContext *avctx, void *arg)
                                     dct_mode                        * 22 * 64 +
                                     (quant + ff_dv_quant_offset[class1]) * 64];
             }
-            dc = dc << 2;
+            dc = dc * 4;
             /* convert to unsigned because 128 is not added in the
              * standard IDCT */
             dc                   += 1024;