dm ioctl: prevent empty message
Detect invalid empty messages in core dm instead of requiring every target to
check this.
Signed-off-by: Alasdair G Kergon <agk@redhat.com>
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Detect invalid empty messages in core dm instead of requiring every target to
check this.
Signed-off-by: Alasdair G Kergon <agk@redhat.com>