Use proper type.

Signed-off-by: James Brodman <[email protected]>

Author: jbrodman

sycl/doc/extensions/USM/USM.adoc

@@ -530,7 +530,7 @@ float* c = static_cast<float*>(malloc_shared(10*sizeof(float), dev, ctxt));
 
 auto e = q.submit([&](handler& cgh) {
   cgh.parallel_for<class vec_add>(range<1> {10}, [=](id<1> ID) {
-    int i = ID[0];
+    size_t i = ID[0];
     c[i] = a[i] + b[i];
   });
 });