[dialyzer] crash while formatting error message

[RobinMorisset]

Describe the bug
Running dialyzer on the following code:

f(X = '原子') ->
    <<X/utf8>>.

results in the following error message:

Runtime terminating during boot ({badarg,[{io_lib,format,[[_],[_]],[{_},{_}]},{dialyzer,format_warning,2,[{_},{_}]},{dialyzer_cl,-print_warnings/1-lc$^0/1-0-,2,[{_},{_}]},{dialyzer_cl,-print_warnings/1-lc$^0/1-0-,2,[{_},{_}]},{dialyzer_cl,print_warnings,1,[{_},{_}]},{lists,foreach_1,2,[{_},{_}]},{dialyzer_cl,return_value,2,[{_},{_}]},{dialyzer_cl,do_analysis,4,[{_},{_}]}]})

Affected versions
master