libqos: Fixes a small memory leak.

Allow users the chance to clean up the QPCIBusPC structure
by adding a small cleanup routine. Helps clear up small
memory leaks during setup/teardown, to allow for cleaner
debug output messages.

Signed-off-by: John Snow <jsnow@redhat.com>
Signed-off-by: Stefan Hajnoczi <stefanha@redhat.com>

tests/libqos/pci-pc.c

diff --git a/tests/libqos/pci-pc.c b/tests/libqos/pci-pc.c
index 4adf400..f5d6469 100644
--- a/tests/libqos/pci-pc.c
+++ b/tests/libqos/pci-pc.c
@@ -237,3 +237,10 @@
 
     return &ret->bus;
 }
+
+void qpci_free_pc(QPCIBus *bus)
+{
+    QPCIBusPC *s = container_of(bus, QPCIBusPC, bus);
+
+    g_free(s);
+}

tests/libqos/pci-pc.h

diff --git a/tests/libqos/pci-pc.h b/tests/libqos/pci-pc.h
index 4f7475f..2621179 100644
--- a/tests/libqos/pci-pc.h
+++ b/tests/libqos/pci-pc.h
@@ -16,5 +16,6 @@
 #include "libqos/pci.h"
 
 QPCIBus *qpci_init_pc(void);
+void     qpci_free_pc(QPCIBus *bus);
 
 #endif