Attached is a possible fix for this bug which replaces the sed magic by a call to 'dpkg --compare-versions'. According to the manpage it checks for empty arguments, so this should be no problem (though I'm not sure wheter we should use 'lt-nl' instead of 'lt' to compare).
--- lockdev-1.0.3/debian/liblockdev1.postinst.orig 2006-06-07 21:15:50.000000000 +0200 +++ lockdev-1.0.3/debian/liblockdev1.postinst 2006-06-07 21:26:49.000000000 +0200 @@ -1,6 +1,6 @@ #!/bin/sh -e -if [ "$1" = "configure" -a "`echo $2 | sed -e 's/[.-]//g'`" -lt 1031 ] +if [ "$1" = "configure" ] && dpkg --compare-versions "$2" lt 1.0.3-1 then echo "" >&2 echo "WARNING" >&2
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