Return STATUS_UNEXPECTED_NULL instead of STATUS_NO_MEMORY

...when the allocation fails and len <= 0. This is the expected
behavior that we have elsewhere when failing to allocate.

Flag: EXEMPT bug fix
Test: CtsNdkBinderTestCases
Bug: 404865966

Change-Id: I797aed6dd830753cdf3482fe4fd38ef1525f41aa
1 file changed