For default function arguments do not access an out of range real argument.
For default function arguments do not access an out of range real argument.

The code should only look at the real argument that exist any missing
arguments default to not being defined and hence needs to use the
default expression. Found with valgrind.

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