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vpx_get16x16var_avx2: correct cast order

allow the right shift to operate on 64-bits, this matches the rest of
the implementations

missed in:
6acd061aa variance_avx2: sync variance functions with c-code

Change-Id: Icae436b881251ccb9f9ed64fcbf8d358c58a4617

--- a/vpx_dsp/x86/variance_avx2.c

+++ b/vpx_dsp/x86/variance_avx2.c

@@ -44,7 +44,7 @@

   int sum;

   variance_avx2(src, src_stride, ref, ref_stride, 16, 16, sse, &sum,

                 vpx_get16x16var_avx2, 16);

-  return *sse - (((uint32_t)((int64_t)sum * sum)) >> 8);

+  return *sse - (uint32_t)(((int64_t)sum * sum) >> 8);

 }

 unsigned int vpx_mse16x16_avx2(const uint8_t *src, int src_stride,