Description of problem:
Valgrind complains use after free issue when escaping sequence for console.

Version-Release number of selected component (if applicable):
# rpm -q libvirt
libvirt-0.10.0-0rc0.el6.x86_64

How reproducible:
always

Steps to Reproduce:
1. valgrind -v --leak-check=full virsh console <domain>
2. ctrl+]
3.
  
Actual results:

==16663== 1 errors in context 1 of 2:
==16663== Invalid read of size 4
==16663==    at 0x4D04C3F: virStreamFree (libvirt.c:15347)
==16663==    by 0x40B121: vshRunConsole (console.c:404)
==16663==    by 0x420E0E: cmdRunConsole (virsh-domain.c:1658)
==16663==    by 0x4211BE: cmdConsole (virsh-domain.c:1693)
==16663==    by 0x41B574: vshCommandRun (virsh.c:1877)
==16663==    by 0x42D476: main (virsh.c:3282)
==16663==  Address 0x52bb980 is 0 bytes inside a block of size 40 free'd
==16663==    at 0x4A0595D: free (vg_replace_malloc.c:366)
==16663==    by 0x4C7B418: virFree (memory.c:309)
==16663==    by 0x4CEC39B: virUnrefStream (datatypes.c:1084)
==16663==    by 0x4D04C5F: virStreamFree (libvirt.c:15355)
==16663==    by 0x40A8C0: virConsoleShutdown (console.c:103)
==16663==    by 0x4C7459E: virEventPollRunOnce (event_poll.c:485)
==16663==    by 0x4C73346: virEventRunDefaultImpl (event.c:247)
==16663==    by 0x42A901: vshEventLoop (virsh.c:2416)
==16663==    by 0x4C849A8: virThreadHelper (threads-pthread.c:161)
==16663==    by 0x38BAA077F0: start_thread (pthread_create.c:301)
==16663==    by 0x33F68E570C: clone (clone.S:115)

Expected results:

fix it.

Additional info:

# virsh dumpxml foo

# virsh dumpxml foo
<domain type='qemu' id='1'>
  <name>foo</name>
  <uuid>595958e9-0a1e-e406-6b9e-0e85cfdbaf3d</uuid>
  <memory unit='KiB'>220160</memory>
  <currentMemory unit='KiB'>220160</currentMemory>
  <vcpu placement='static'>4</vcpu>
  <os>
    <type arch='x86_64' machine='rhel6.3.0'>hvm</type>
    <boot dev='hd'/>
  </os>
  <clock offset='utc'/>
  <on_poweroff>destroy</on_poweroff>
  <on_reboot>restart</on_reboot>
  <on_crash>destroy</on_crash>
  <devices>
    <emulator>/usr/libexec/qemu-kvm</emulator>
    <disk type='file' device='disk'>
      <driver name='qemu' type='qcow2'/>
      <source file='/var/lib/libvirt/images/foo'/>
      <target dev='vda' bus='virtio'/>
      <alias name='virtio-disk0'/>
      <address type='pci' domain='0x0000' bus='0x00' slot='0x03' function='0x0'/>
    </disk>
    <controller type='usb' index='0'>
      <alias name='usb0'/>
      <address type='pci' domain='0x0000' bus='0x00' slot='0x01' function='0x2'/>
    </controller>
    <controller type='ide' index='0'>
      <alias name='ide0'/>
      <address type='pci' domain='0x0000' bus='0x00' slot='0x01' function='0x1'/>
    </controller>
    <serial type='pty'>
      <source path='/dev/pts/6'/>
      <target port='0'/>
      <alias name='serial0'/>
    </serial>
    <console type='pty' tty='/dev/pts/6'>
      <source path='/dev/pts/6'/>
      <target type='serial' port='0'/>
      <alias name='serial0'/>
    </console>
    <input type='mouse' bus='ps2'/>
    <graphics type='spice' port='5901' autoport='yes' listen='0.0.0.0'>
      <listen type='address' address='0.0.0.0'/>
    </graphics>
    <video>
      <model type='cirrus' vram='9216' heads='1'/>
      <alias name='video0'/>
      <address type='pci' domain='0x0000' bus='0x00' slot='0x02' function='0x0'/>
    </video>
    <memballoon model='virtio'>
      <alias name='balloon0'/>
      <address type='pci' domain='0x0000' bus='0x00' slot='0x04' function='0x0'/>
    </memballoon>
  </devices>
  <seclabel type='dynamic' model='selinux' relabel='yes'>
    <label>system_u:system_r:svirt_t:s0:c220,c851</label>
    <imagelabel>system_u:object_r:svirt_image_t:s0:c220,c851</imagelabel>
  </seclabel>
</domain>