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Description of problem:
libvirt crash when "virsh nodedev-define" with wrong formatted <uuid> in xml 

Version-Release number of selected component (if applicable):
libvirt-7.8.0-1.el9
qemu-kvm-6.1.0-6.el9

How reproducible:
100%

Steps to Reproduce:
1.prepare a xml file for define mdev device with an invalid uuid
#vi mdev.xml
<device>
  <name>mdev_4187c971_5830_4a17_aed7_b1410c7eb63a_0000_5b_00_0</name>
  <parent>computer</parent>
  <capability type='mdev'>
    <type id='nvidia-262'/>
    <uuid>4187aed7-b1410c7eb63a</uuid>
    <iommuGroup number='0'/>
  </capability>
</device>



2.try to define the device
# virsh nodedev-define md.xml 
error: Disconnected from qemu:///system due to end of file
error: Failed to define node device from 'md.xml'
error: End of file while reading data: Input/output error

Error message in /var/log/libvirt/libvirtd.log 
"2021-11-03 07:42:13.601+0000: 18508: error : virNodeDevCapMdevParseXML:1924 : internal error: Invalid uuid '4187aed7-b1410c7eb63a' for new mdev device"


3.

Actual results:
device define failed and libvirt crash 

Expected results:
output error message like "error: internal error: malformed uuid element" when device define failed

Additional info:

This is the same root cause as https://bugzilla.redhat.com/show_bug.cgi?id=2014139 . The parser returns a NULL object if the XML is invalid and then we tried to invoke the post-parse callbacks.

*** This bug has been marked as a duplicate of bug 2014139 ***