Cleanup the null checks added in ag/30408877

These checks should be safe, but could be hiding other issues.
They were originally added as a workaround for presubmit failures
only on mokey_go32 (32 bit Android Go).

Bug: NA
Flag: EXEMPT cleanup
Test: Manual and existing presubmit tests
Change-Id: Ifcd136f61c885dba316e492a2408b67b42dcffcf