ICU-22934 clean up error handling in PR#3230 #2997

Job	Run time
clang-valgrind-intltest (utility)	6m 50s
clang-valgrind-intltest (normalize)	6m 31s
clang-valgrind-test	10m 26s
clang-valgrind-intltest (collator)	5m 33s
clang-valgrind-intltest (regex)	5m 33s
clang-valgrind-intltest (format)	16m 15s
clang-valgrind-intltest (translit)	7m 17s
clang-valgrind-intltest (rbbi)	7m 43s
clang-valgrind-intltest (rbnf)	6m 45s
clang-valgrind-intltest (rbnfrt)	6m 23s
clang-valgrind-intltest (icuserv)	5m 39s
clang-valgrind-intltest (idna)	5m 25s
clang-valgrind-intltest (convert)	6m 48s
clang-valgrind-intltest (rbnfp)	5m 20s
clang-valgrind-intltest (csdet)	5m 24s
clang-valgrind-intltest (spoof)	5m 33s
clang-valgrind-intltest (bidi)	5m 59s
	1h 59m 24s

Provide feedback