net/af-xdp.c: Don't leak sock_fds array in net_init_af_xdp()

In net_init_af_xdp() we parse the arguments and allocate
a buffer of ints into sock_fds. However, although we
free this in the error exit path, we don't ever free it
in the successful return path. Coverity spots this leak.

Switch to g_autofree so we don't need to manually free the
array.

Resolves: Coverity CID 1534906
Signed-off-by: Peter Maydell <peter.maydell@linaro.org>
Reviewed-by: Richard Henderson <richard.henderson@linaro.org>
Reviewed-by: Thomas Huth <thuth@redhat.com>
Message-id: 20240312183810.557768-4-peter.maydell@linaro.org

net/af-xdp.c

@@ -446,7 +446,7 @@ int net_init_af_xdp(const Netdev *netdev,
     NetClientState *nc, *nc0 = NULL;
     unsigned int ifindex;
     uint32_t prog_id = 0;
-    int *sock_fds = NULL;
+    g_autofree int *sock_fds = NULL;
     int64_t i, queues;
     Error *err = NULL;
     AFXDPState *s;
@@ -516,7 +516,6 @@ int net_init_af_xdp(const Netdev *netdev,
     return 0;
 
 err:
-    g_free(sock_fds);
     if (nc0) {
         qemu_del_net_client(nc0);
     }