vp3: fix streams with non-zero last coefficient

Fixes a regression introduced in 8b94df0f2047e972.
(cherry picked from commit 9b4767e4784577f3107730316fe652ccaccd9b3a)

Signed-off-by: Reinhard Tartler <siretart@tauware.de>
(cherry picked from commit 82a11fcff24d9827070d77f1a3c6ba5d4dc12984)

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

libavcodec/vp3.c

@@ -1316,6 +1316,8 @@ static inline int vp3_dequant(Vp3DecodeContext *s, Vp3Fragment *frag,
             return i;
         }
     } while (i < 64);
+    // return value is expected to be a valid level
+    i--;
 end:
     // the actual DC+prediction is in the fragment structure
     block[0] = frag->dc * s->qmat[0][inter][plane][0];