libavcodec/dv.c: Fix duplicate words

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

libavcodec/dv.c

@@ -551,7 +551,7 @@ static av_always_inline int dv_init_enc_block(EncBlockInfo* bi, uint8_t *data, i
 
           if (level + 15 > 30U) {
               bi->sign[i] = (level >> 31) & 1;
-              /* weight it and and shift down into range, adding for rounding */
+              /* weight it and shift down into range, adding for rounding */
               /* the extra division by a factor of 2^4 reverses the 8x expansion of the DCT
                  AND the 2x doubling of the weights */
               level = (FFABS(level) * weight[i] + (1 << (dv_weight_bits+3))) >> (dv_weight_bits+4);