Check the return value of setuid(2).

I'd like to mark setuid() WARN_UNUSED_RESULT to prevent security bugs.
This line would break because the file is compiled with -Werror.

Bug: 34251640
Test: Build, run unit test.
Change-Id: Ibb6fa5e5b899d47f77f2a32da762165de310101d
1 file changed