ICU-22796 Bugfix: Memory access after uprv_free() #2287

Job	Run time
clang-valgrind-test	10m 9s
clang-valgrind-intltest (utility)	7m 50s
clang-valgrind-intltest (normalize)	5m 54s
clang-valgrind-intltest (collator)	5m 6s
clang-valgrind-intltest (regex)	5m 30s
clang-valgrind-intltest (format)	16m 34s
clang-valgrind-intltest (translit)	6m 10s
clang-valgrind-intltest (rbbi)	7m 13s
clang-valgrind-intltest (rbnf)	5m 58s
clang-valgrind-intltest (rbnfrt)	6m 7s
clang-valgrind-intltest (icuserv)	5m 8s
clang-valgrind-intltest (idna)	5m 0s
clang-valgrind-intltest (convert)	6m 34s
clang-valgrind-intltest (rbnfp)	5m 16s
clang-valgrind-intltest (csdet)	4m 48s
clang-valgrind-intltest (spoof)	4m 48s
clang-valgrind-intltest (bidi)	5m 8s
	1h 53m 13s

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