update-index: do not die too early in a read-only repository.
This delays the error exit from hold_lock_file_for_update() in
update-index, so that "update-index --refresh" in a read-only
repository can still report what paths are stat-dirty before
exiting.
Also it makes -q to squelch the error message.
Signed-off-by: NJunio C Hamano <junkio@cox.net>
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