qemuBuildHostNetStr: Don't leak @addr
qemuBuildHostNetStr: Don't leak @addr

The virSocketAddrFormat() allocates the string and it's caller
responsibility to free it afterwards.

==28857== 11 bytes in 1 blocks are definitely lost in loss record 37 of 168
==28857==    at 0x4C2BEDF: malloc (vg_replace_malloc.c:299)
==28857==    by 0x9A81D79: strdup (in /lib64/libc-2.23.so)
==28857==    by 0x5DA3BF0: virStrdup (virstring.c:902)
==28857==    by 0x5D96182: virSocketAddrFormatFull (virsocketaddr.c:427)
==28857==    by 0x5D95E13: virSocketAddrFormat (virsocketaddr.c:352)
==28857==    by 0x5706890: qemuBuildHostNetStr (qemu_command.c:3891)
==28857==    by 0x57138D3: qemuBuildInterfaceCommandLine (qemu_command.c:8597)
==28857==    by 0x5713D6A: qemuBuildNetCommandLine (qemu_command.c:8699)
==28857==    by 0x57176F6: qemuBuildCommandLine (qemu_command.c:10027)
==28857==    by 0x5769D61: qemuProcessCreatePretendCmd (qemu_process.c:6004)
==28857==    by 0x4056EC: testCompareXMLToArgv (qemuxml2argvtest.c:502)
==28857==    by 0x41DF40: virTestRun (testutils.c:180)

Signed-off-by: Michal Privoznik <83d82aaba2eed257f4814b0c239c260c4caaadf0@redhat.com>
Reviewed-by: John Ferlan <87558058f6f829e5ec976c8ef960720af4ff9c7d@redhat.com>

libvirt/libvirt,olafhering/libvirt,jardasgit/libvirt,nertpinx/libvirt,crobinso/libvirt,jardasgit/libvirt,andreabolognani/libvirt,zippy2/libvirt,fabianfreyer/libvirt,nertpinx/libvirt,olafhering/libvirt,eskultety/libvirt,libvirt/libvirt,jfehlig/libvirt,zippy2/libvirt,eskultety/libvirt,olafhering/libvirt,fabianfreyer/libvirt,fabianfreyer/libvirt,olafhering/libvirt,jardasgit/libvirt,libvirt/libvirt,crobinso/libvirt,nertpinx/libvirt,jfehlig/libvirt,andreabolognani/libvirt,crobinso/libvirt,andreabolognani/libvirt,eskultety/libvirt,jardasgit/libvirt,nertpinx/libvirt,nertpinx/libvirt,andreabolognani/libvirt,zippy2/libvirt,libvirt/libvirt,jfehlig/libvirt,crobinso/libvirt,eskultety/libvirt,zippy2/libvirt,fabianfreyer/libvirt,jardasgit/libvirt,andreabolognani/libvirt,jfehlig/libvirt,eskultety/libvirt,fabianfreyer/libvirt