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vpx_variance16x16_sse2: correct cast order

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

previously:
b0f1ae147 vpx_get16x16var_avx2: correct cast order

Change-Id: I632ee5e418f3f9b30e79ecd05588eb172b0783aa

--- a/vpx_dsp/x86/variance_sse2.c

+++ b/vpx_dsp/x86/variance_sse2.c

@@ -222,7 +222,7 @@

                                     unsigned int *sse) {

   int sum;

   vpx_get16x16var_sse2(src, src_stride, ref, ref_stride, sse, &sum);

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

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

 }

 unsigned int vpx_variance32x32_sse2(const uint8_t *src, int src_stride,