ICU-22912 fix coverity warning in gencnval.c

[mike-fabian]

See: https://unicode-org.atlassian.net/browse/ICU-22912

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[markusicu]

Thanks for the straightforward fix in old-fashioned code. We should really switch these tools to using std::string -- or our own, internal icu::CharString which has a nice function for appending a path part.

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