Description of problem:
Running virt-clone errors out

Version-Release number of selected component (if applicable):
virt-install-1.6.0-1.3.git3bc7ff24c.fc29.noarch

How reproducible:


Steps to Reproduce:
1.
2.
3.

Actual results:
[Fri, 01 Feb 2019 15:49:18 virt-clone 15046] DEBUG (cli:277)   File "/usr/share/virt-manager/virt-clone", line 213, in <module>
    fail(main_e)
  File "/usr/share/virt-manager/virtinst/cli.py", line 277, in fail
    logging.debug("".join(traceback.format_stack()))

[Fri, 01 Feb 2019 15:49:18 virt-clone 15046] ERROR (cli:278) local variable 'need' referenced before assignment
[Fri, 01 Feb 2019 15:49:18 virt-clone 15046] DEBUG (cli:280) 
Traceback (most recent call last):
  File "/usr/share/virt-manager/virt-clone", line 207, in <module>
    sys.exit(main())
  File "/usr/share/virt-manager/virt-clone", line 193, in main
    design.setup_clone()
  File "/usr/share/virt-manager/virtinst/cloner.py", line 418, in setup_clone
    self._setup_disk_clone_destination(orig_disk, clone_disk)
  File "/usr/share/virt-manager/virtinst/cloner.py", line 342, in _setup_disk_clone_destination
    clone_disk.validate()
  File "/usr/share/virt-manager/virtinst/devices/disk.py", line 882, in validate
    self._storage_backend.validate(self)
  File "/usr/share/virt-manager/virtinst/diskbackend.py", line 340, in validate
    err, msg = self.is_size_conflict()
  File "/usr/share/virt-manager/virtinst/diskbackend.py", line 383, in is_size_conflict
    if need > avail:
UnboundLocalError: local variable 'need' referenced before assignment

Expected results:


Additional info:
Fixed in upstream: https://github.com/virt-manager/virt-manager/commit/722886748006b880ff6a99781b2aca0751aafc55#diff-33560dd1575b58f1a4602a360b2d8486