Fix ProfileSaver logging

The LOG(ERROR) should have been a LOG(WARNING) and because the
run-test captures the errors, test 595 is failing.

Test: m test-art-host-run-test-595-profile-saving
Bug: 37711886
Change-Id: I69fa46d763e8e5f59c0f6a9778f725ee559eff6a
1 file changed