Make code using the same indicators point to a single allocated structure
that is freed when the last user goes away.
This will be used by the irqfd code to unmap addresses after the last user
is gone.
Reviewed-by: Thomas Huth <thuth@linux.vnet.ibm.com>
Reviewed-by: Christian Borntraeger <borntraeger@de.ibm.com>
Signed-off-by: Cornelia Huck <cornelia.huck@de.ibm.com>
7bca3892cb