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vp9_decodframe.c: use vpx_memset instead of cast

Fix warning with -Wstrict-aliasing=1

Change-Id: Idfac09be1ab328923883e63436577f1018c895b8

--- a/vp9/decoder/vp9_decodframe.c

+++ b/vp9/decoder/vp9_decodframe.c

@@ -276,7 +276,7 @@

     }

     if (eob == 1) {

-      *((int32_t *)qcoeff) = 0;

+      vpx_memset(qcoeff, 0, 2 * sizeof(qcoeff[0]));

     } else {

       if (tx_type == DCT_DCT && tx_size <= TX_16X16 && eob <= 10)

         vpx_memset(qcoeff, 0, 4 * (4 << tx_size) * sizeof(qcoeff[0]));