src: remove unused assignments
When invoking C++ member methods through async callbacks, the this
pointer is passed through the async signal strcture. Now with recent
changes, in the callback we are obtaining the his pointer reflectively
through applying pointer arithmetic on the async field, effectively
making this assignments redundant.
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