Remove unneeded mask variable in tgt-vvp/eval_real.c
Remove unneeded mask variable in tgt-vvp/eval_real.c

The mask variable was not used in the draw_number_real() routine.

CastMi/iverilog,themperek/iverilog,themperek/iverilog,CastMi/iverilog,themperek/iverilog,CastMi/iverilog