[native] Fix error check condition

Summary:
In the D7530 Test Plan I mention:

Flipped boolean and observed that Alert appeared as expected

Well, looks like I included the flipped condition in the diff... thankfully it was easy to catch.

Test Plan: Setting image avatar works again

Reviewers: ashoat, ginsu

Reviewed By: ginsu

Subscribers: tomek

Differential Revision: https://phab.comm.dev/D7542