mpc8: make maxband check less picky.

Fixes Ticket1245
Signed-off-by: Michael Niedermayer <michaelni@gmx.at>

libavcodec/mpc8.c

@@ -272,7 +272,7 @@ static int mpc8_decode_frame(AVCodecContext * avctx, void *data,
         maxband = c->last_max_band + get_vlc2(gb, band_vlc.table, MPC8_BANDS_BITS, 2);
         if(maxband > 32) maxband -= 33;
     }
-    if(maxband > c->maxbands)
+    if(maxband >= BANDS)
         return AVERROR_INVALIDDATA;
     c->last_max_band = maxband;