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 <mprivozn@redhat.com>
    Reviewed-by: John Ferlan <jferlan@redhat.com>