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checkout: do not make a temporary copy of symlink target.
If the index records an insanely long symbolic link, copying into the temporary would overflow the buffer (noticed by Mark Wooding). Because read_sha1_file() terminates the returned buffer with NUL since late May 2005, there is no reason to copy it anymore. Signed-off-by: Junio C Hamano <junkio@cox.net>
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