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Fix an ubsan warning: vp9_quantizer.c

BUG=https://bugs.chromium.org/p/webm/issues/detail?id=1219

Change-Id: Ie1bfda4d51c1567f551515f0ed113eec1bc1d98c

--- a/vp9/encoder/vp9_quantize.c

+++ b/vp9/encoder/vp9_quantize.c

@@ -94,7 +94,7 @@

       const int coeff_sign = (coeff >> 31);

       const int abs_coeff = (coeff ^ coeff_sign) - coeff_sign;

       const int64_t tmp = abs_coeff + round_ptr[rc != 0];

-      const uint32_t abs_qcoeff = (uint32_t)((tmp * quant_ptr[rc != 0]) >> 16);

+      const int abs_qcoeff = (int)((tmp * quant_ptr[rc != 0]) >> 16);

       qcoeff_ptr[rc] = (tran_low_t)((abs_qcoeff ^ coeff_sign) - coeff_sign);

       dqcoeff_ptr[rc] = qcoeff_ptr[rc] * dequant_ptr[rc != 0];

       if (abs_qcoeff)