[Libvir] plug small leaks upon failure

[Jim Meyering]

with more than 20 domains, I get this:

  $ valgrind --leak-check=full ./virsh --connect test://$PWD/../docs/testnode.xml list
  ...
  error: failed to connect to the hypervisor
  ...
  ==13756== 5 bytes in 1 blocks are definitely lost in loss record 1 of 32
  ==13756==    at 0x4A059F6: malloc (vg_replace_malloc.c:149)
  ==13756==    by 0x387BC7CC11: strdup (strdup.c:43)
  ==13756==    by 0x41D9F2: virXPathString (xml.c:486)
  ==13756==    by 0x4174D3: testLoadDomain (test.c:248)
  ==13756==    by 0x417BA4: testLoadDomainFromFile (test.c:401)
  ==13756==    by 0x418E57: testOpenFromFile (test.c:797)
  ==13756==    by 0x4192CE: testOpen (test.c:913)
  ==13756==    by 0x40FA20: do_open (libvirt.c:572)
  ==13756==    by 0x40FDE4: virConnectOpenAuth (libvirt.c:681)
  ==13756==    by 0x40D5B1: vshInit (virsh.c:4464)
  ==13756==    by 0x40E67C: main (virsh.c:4985)
  ==13756==
  ==13756==
  ==13756== 12,996 (352 direct, 12,644 indirect) bytes in 1 blocks are definitely lost in loss record 31 of 32
  ==13756==    at 0x4A059F6: malloc (vg_replace_malloc.c:149)
  ==13756==    by 0x38864880E6: xmlXPathNewContext (in /usr/lib64/libxml2.so.2.6.31)
  ==13756==    by 0x417494: testLoadDomain (test.c:242)
  ==13756==    by 0x417BA4: testLoadDomainFromFile (test.c:401)
  ==13756==    by 0x418E57: testOpenFromFile (test.c:797)
  ==13756==    by 0x4192CE: testOpen (test.c:913)
  ==13756==    by 0x40FA20: do_open (libvirt.c:572)
  ==13756==    by 0x40FDE4: virConnectOpenAuth (libvirt.c:681)
  ==13756==    by 0x40D5B1: vshInit (virsh.c:4464)
  ==13756==    by 0x40E67C: main (virsh.c:4985)
  ==13756==
  ==13756== LEAK SUMMARY:
  ==13756==    definitely lost: 357 bytes in 2 blocks.
  ==13756==    indirectly lost: 12,644 bytes in 32 blocks.
  ==13756==      possibly lost: 0 bytes in 0 blocks.
  ==13756==    still reachable: 20,614 bytes in 362 blocks.
  ==13756==         suppressed: 0 bytes in 0 blocks.
  ==13756== Reachable blocks (those to which a pointer was found) are not shown.
  ==13756== To see them, rerun with: --leak-check=full --show-reachable

Here's the fix:

	* test.c (testLoadDomain): Avoid leaks upon failure.

---
 src/test.c |    2 +-
 1 files changed, 1 insertions(+), 1 deletions(-)

diff --git a/src/test.c b/src/test.c
index fe5da41..ab83f65 100644
--- a/src/test.c
+++ b/src/test.c
@@ -327,7 +327,7 @@ static int testLoadDomain(virConnectPtr conn,
         }
     }
     if (handle < 0)
-        return (-1);
+        goto error;

     privconn->domains[handle].active = 1;
     privconn->domains[handle].id = domid;
--
1.5.4.rc5.1.g0fa73