qemu-img: Make resize error message more general
The issue: $ qemu-img resize -f qcow2 foo.qcow2 qemu-img: Expecting one image file name Try 'qemu-img --help' for more information So we gave an image file name, but we omitted the length. qemu-img thinks the last argument is always the size and removes it immediately from argv (by decrementing argc), and tries to verify that it is a valid size only at a later point. So we do not actually know whether that last argument we called "size" is indeed a size or whether the user instead forgot to specify that size but did give a file name. Therefore, the error message should be more general. Bug: https://bugzilla.redhat.com/show_bug.cgi?id=1523458Signed-off-by: NMax Reitz <mreitz@redhat.com> Message-id: 20180205162745.23650-1-mreitz@redhat.com Reviewed-by: NJohn Snow <jsnow@redhat.com> Reviewed-by: NEric Blake <eblake@redhat.com> Signed-off-by: NMax Reitz <mreitz@redhat.com>
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