ICU-22934 clean up error handling in PR#3230 #2998

Job	Run time
clang-valgrind-intltest (utility)	7m 9s
clang-valgrind-intltest (normalize)	6m 32s
clang-valgrind-intltest (collator)	5m 46s
clang-valgrind-intltest (regex)	5m 26s
clang-valgrind-intltest (format)	16m 21s
clang-valgrind-intltest (translit)	5m 57s
clang-valgrind-intltest (rbbi)	7m 43s
clang-valgrind-intltest (rbnf)	6m 28s
clang-valgrind-intltest (rbnfrt)	6m 16s
clang-valgrind-intltest (icuserv)	5m 52s
clang-valgrind-intltest (idna)	5m 55s
clang-valgrind-intltest (convert)	6m 51s
clang-valgrind-intltest (rbnfp)	5m 20s
clang-valgrind-test	11m 30s
clang-valgrind-intltest (csdet)	5m 12s
clang-valgrind-intltest (spoof)	5m 32s
clang-valgrind-intltest (bidi)	5m 27s
	1h 59m 17s

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