cxxrtl: fix handling of 0-bit variables in `vcd_writer.sample()`. #1004

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10 warnings

‘inner’ may be used uninitialized in this function [-Wmaybe-uninitialized]

‘inner’ may be used uninitialized in this function [-Wmaybe-uninitialized]

‘inner’ may be used uninitialized in this function [-Wmaybe-uninitialized]

‘inner’ may be used uninitialized in this function [-Wmaybe-uninitialized]

‘inner’ may be used uninitialized in this function [-Wmaybe-uninitialized]

‘inner’ may be used uninitialized in this function [-Wmaybe-uninitialized]

variable ‘box_inputs’ set but not used [-Wunused-but-set-variable]

variable ‘box_id’ set but not used [-Wunused-but-set-variable]

variable ‘box_outputs’ set but not used [-Wunused-but-set-variable]

variable ‘box_id’ set but not used [-Wunused-but-set-variable]