Return correct cas from WriteUpdateWithXattrs #9843

Job	Run time
build	1m 15s
lint	39s
test (macos)	3m 43s
addlicense	10s
test-race	5m 8s
test (windows)	5m 38s
test-sgcollect (macos-latest)	57s
test (ubuntu)	3m 35s
test-sgcollect (windows-latest)	3m 59s
test-stats-definition-exporter (macos-latest)	23s
test-sgcollect (ubuntu-latest)	24s
test-stats-definition-exporter (windows-latest)	2m 42s
test-stats-definition-exporter (ubuntu-latest)	1m 10s
	29m 43s

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