fix typo

Author: adstraw

src/runtime/hexagon/hexagon/hexagon_buffer.cc

@@ -51,7 +51,7 @@ struct DDRAllocation : public Allocation {
   DDRAllocation(size_t nbytes, size_t alignment) : Allocation(nbytes, alignment) {
 #ifdef _WIN32
     data_ = _aligned_malloc(nbytes, alignment);
-    CHECK(data != nullptr);
+    CHECK(data_ != nullptr);
 #else
     int ret = posix_memalign(&data_, alignment, nbytes);
     CHECK_EQ(ret, 0);