mkimage: allow -l to work on block devices on Linux
When "mkimage -l" was run on a block device it would fail with erroneous message, because fstat reports a size of zero for those: mkimage: Bad size: "/dev/sdb4" is not valid image This patch identifies the "is a block device" case and reports it as such, and if it knows how to determine the size of a block device on the current OS, proceeds. As shown in http://www.mit.edu/afs.new/sipb/user/tytso/e2fsprogs/lib/blkid/getsize.c this is no portable task, and I only handled the case of a modern Linux kernel, which is what I can test. Signed-off-by:Yann Dirson <yann@blade-group.com>
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