vp6: Fix illegal read.

(cherry picked from commit 2a6eb06254)

Signed-off-by: Reinhard Tartler <siretart@tauware.de>
(cherry picked from commit 67a7ed623b)

Signed-off-by: Reinhard Tartler <siretart@tauware.de>

libavcodec/vp6.c

@@ -373,7 +373,7 @@ static void vp6_parse_coeff_huffman(VP56Context *s)
         if (b > 3) pt = 1;
         vlc_coeff = &s->dccv_vlc[pt];
 
-        for (coeff_idx=0; coeff_idx<64; ) {
+        for (coeff_idx = 0;;) {
             int run = 1;
             if (coeff_idx<2 && s->nb_null[coeff_idx][pt]) {
                 s->nb_null[coeff_idx][pt]--;
@@ -410,6 +410,8 @@ static void vp6_parse_coeff_huffman(VP56Context *s)
                 }
             }
             coeff_idx+=run;
+            if (coeff_idx >= 64)
+                break;
             cg = FFMIN(vp6_coeff_groups[coeff_idx], 3);
             vlc_coeff = &s->ract_vlc[pt][ct][cg];
         }