The nondet symbol factory uses "tmp" as a default basename prefix, and
in all other places already generated unique names using
get_fresh_aux_symbol. This function, however, will happily use exactly
that basename when there wouldn't be a conflict. The code fixed in this
commit, however, did not yet use this facility, and just assumed that
each parameter of the target function would result in a unique local
name. A parameter named "tmp," then, resulted in a conflict.
Consistently using get_fresh_aux_symbol addresses this problem.

Fixes: #6566

Co-authored-by: Matthias Güdemann matthias.guedemann@hm.edu

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