[SYCL][E2E] fix one test leak

[yingcong-wu]

Because SYCL will throw an exception, malloced ptr will never freed, which is a leak. Use std::vector to make it freed automatically.

[maarquitos14]

Good catch! Thanks!

[yingcong-wu]

Hi @maarquitos14 , I see from the failed test result that those failures seem not related to this PR. I wonder if they are flaky or what?

CUDA E2E
Failed Tests (1):
  SYCL :: Regression/vec_rel_swizzle_ops.cpp

AMD/HIP, ["Linux", "amdgpu"]
Failed Tests (1):
  SYCL :: Regression/vec_rel_swizzle_ops.cpp

e2e / Intel GEN12 Graphics with Level Zero
Timed Out Tests (1):
  SYCL :: Basic/vector/int-convert.cpp

[maarquitos14]

They're not flaky, but they are known. They are addressed in #12040, #12043. I think this is good to merge, but I'll let @intel/llvm-gatekeepers decide.

[aelovikov-intel]

Just

Suggested change

	sycl::buffer<float> buf(array.data(), sycl::range<1>{n});
	sycl::buffer<float> buf(sycl::range<1>{n});

without any vectors/pointers would be enough for this test, I think...

[yingcong-wu]

Sure, I will try to use this constructor next time I see some similar problems.