Fix a qemuDomainPCIAddressSetFree memory leak

qemuDomainPCIAddressSetFree was freeing up the hash
table for the pci addresses, but not freeing up the addr
structure.  Looking over the callers of this function, it
seems like they expect it to also free up the structure,
so do that here.
Signed-off-by: NChris Lalancette <clalance@redhat.com>

src/qemu/qemu_conf.c

@@ -2110,7 +2110,7 @@ void qemuDomainPCIAddressSetFree(qemuDomainPCIAddressSetPtr addrs)
         return;
 
     virHashFree(addrs->used, qemuDomainPCIAddressSetFreeEntry);
-    addrs->used = NULL;
+    VIR_FREE(addrs);
 }