annotate: fix -S parameter to take a string
In the conversion to Getopt::Long, the -S / --rev-list parameter stopped working. We need to tell Getopt::Long that it is a string. As a bonus, the open() now does some useful error handling. Signed-off-by: NMartin Langhoff <martin@catalyst.net.nz> Signed-off-by: NJunio C Hamano <junkio@cox.net>
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