[HIPIFY][tests] add new line at the end of file

[ROCm/hip commit: d254875c42]

projects/hip/tests/hipify-clang/intro.cu

@@ -171,4 +171,4 @@ __global__ void integration(data gpu) {
     ADD4(gpu.r[i], gpu.v[i]);
     gpu.f[i] = make_float4(0,0,0,0);
   }
-}
+}