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Convert to unsigned int before left shift

This is to fix overflow when 128 is left shifted by 24.

Change-Id: Ibb5f6813536d985afa003a9848c0c3dd358955a7

--- a/vpx_ports/mem_ops.h

+++ b/vpx_ports/mem_ops.h

@@ -89,7 +89,7 @@

   unsigned MEM_VALUE_T  val;

   const MAU_T          *mem = (const MAU_T *)vmem;

-  val = mem[0] << 24;

+  val = ((unsigned int)mem[0]) << 24;

   val |= mem[1] << 16;

   val |= mem[2] << 8;

   val |= mem[3];