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riscv/kstack: Remove riscv_current_ksp as obsolete
Unwinding the kernel stack did not work previously due to the way the task startup logic works via nxtask_start and the up_task_start() system call. After modifying the logic behind those, the kernel stack is in fact fully unwound when return_from_exception is executed, so calling the original hack "riscv_current_ksp" is not necessary anymore.
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