socket_address_flatten() leaks a SocketAddress when its argument is
null.  Happens when opening a ChardevBackend of type 'udp' that is
configured without a local address.  Screwed up in commit bd269ebc due
to last minute semantic conflict resolution.  Spotted by Coverity.

Signed-off-by: Markus Armbruster <armbru@redhat.com>
Message-Id: <1494866344-11013-1-git-send-email-armbru@redhat.com>
Reviewed-by: Eric Blake <eblake@redhat.com>
---
 util/qemu-sockets.c | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/util/qemu-sockets.c b/util/qemu-sockets.c
index d8183f7..b39ae74 100644
--- a/util/qemu-sockets.c
+++ b/util/qemu-sockets.c
@@ -1338,12 +1338,14 @@ char *socket_address_to_string(struct SocketAddress *addr, Error **errp)
 
 SocketAddress *socket_address_flatten(SocketAddressLegacy *addr_legacy)
 {
-    SocketAddress *addr = g_new(SocketAddress, 1);
+    SocketAddress *addr;
 
     if (!addr_legacy) {
         return NULL;
     }
 
+    addr = g_new(SocketAddress, 1);
+
     switch (addr_legacy->type) {
     case SOCKET_ADDRESS_LEGACY_KIND_INET:
         addr->type = SOCKET_ADDRESS_TYPE_INET;
-- 
2.7.4