Description of problem:
How to reproduce?

% make && make -C tests check TESTS=qemuxml2argvtest
% cd tests && valgrind -v --leak-check=full ./qemuxml2argvtest

actual result:

==2143== 12 bytes in 2 blocks are definitely lost in loss record 74 of 179
==2143==    at 0x4A05FDE: malloc (vg_replace_malloc.c:236)
==2143==    by 0x39D90A67DD: xmlStrndup (xmlstring.c:45)
==2143==    by 0x4F5EC0: virDomainDiskDefParseXML (domain_conf.c:3438)
==2143==    by 0x502F00: virDomainDefParseXML (domain_conf.c:8304)
==2143==    by 0x505FE3: virDomainDefParseNode (domain_conf.c:9080)
==2143==    by 0x5069AE: virDomainDefParse (domain_conf.c:9030)
==2143==    by 0x41CBF4: testCompareXMLToArgvHelper (qemuxml2argvtest.c:105)
==2143==    by 0x41E5DD: virtTestRun (testutils.c:145)
==2143==    by 0x416FA3: mymain (qemuxml2argvtest.c:399)
==2143==    by 0x41DCB7: virtTestMain (testutils.c:700)
==2143==    by 0x39CF01ECDC: (below main) (libc-start.c:226)

Version-Release number of selected component (if applicable):


How reproducible:


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Actual results:


Expected results:


Additional info: