Description of problem:

When running livecd-creator multiple times, it can eventually run out of loop
devices.


Version-Release number of selected component (if applicable): livecd-tools-009-1.fc7


How reproducible:

Maybe hard.  I only ran into this after doing many, many livecd builds on a
system, sometimes more than one at a time, some of which I canceled (ctrl-c)
before they were complete.


Steps to Reproduce:
1. Run lots of livecd builds
2. Cancel some of them
3. Maybe run more than one at a time?
  
Actual results:

losetup: could not find any free loop device
Error creating Live CD : Failed to loopback mount
'/var/tmp/livecd-creator-BOnxs8/data/os.img' : Failed to allocate loop device
for '/var/tmp/livecd-creator-BOnxs8/data/os.img'





[root@kandor ~]# mount

[...normal stuff...]

/dev/loop0 on /var/tmp/livecd-creator-zEbpYi/install_root type ext3 (rw)
/sys on /var/tmp/livecd-creator-zEbpYi/install_root/sys type none (rw,bind)
/proc on /var/tmp/livecd-creator-zEbpYi/install_root/proc type none (rw,bind)
/dev on /var/tmp/livecd-creator-zEbpYi/install_root/dev type none (rw,bind)
/dev/pts on /var/tmp/livecd-creator-zEbpYi/install_root/dev/pts type none (rw,bi
nd)
/selinux on /var/tmp/livecd-creator-zEbpYi/install_root/selinux type none (rw,bi
nd)
/var/tmp/livecd-creator-zEbpYi/yum-cache on /var/tmp/livecd-creator-zEbpYi/insta
ll_root/var/cache/yum type none (rw,bind)

[...lots more loopback stuff...]

Expected results:

Warm and toasty livecd image.  livecd-creator should free the loopback device
when I cancel.


Additional info:

I was able to recover from this by unmounting each of the things mounted under
the loopback device's mount point, then the loopback device in question.