assert: fix single assert first line
If simple assert is called in the very first line of a file and it causes an error, it will report the wrong code. The reason is that the column that is reported is faulty.
I tested this locally as it is not as nice to write a proper test for this and I am uncertain if it is worth it adding one. I feel it should be fine to land this without a test if no one disagrees.
Checklist
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make -j4 test
(UNIX), orvcbuild test
(Windows) passes -
tests and/or benchmarks are included -
documentation is changed or added -
commit message follows commit guidelines