tests/qtest/migration: Fix typo for vsock in SocketAddress_to_str

Signed-off-by: Het Gala <het.gala@nutanix.com>
Link: https://lore.kernel.org/r/20240319204840.211632-2-het.gala@nutanix.com
Signed-off-by: Peter Xu <peterx@redhat.com>

tests/qtest/migration-helpers.c

@@ -42,7 +42,7 @@ static char *SocketAddress_to_str(SocketAddress *addr)
     case SOCKET_ADDRESS_TYPE_FD:
         return g_strdup_printf("fd:%s", addr->u.fd.str);
     case SOCKET_ADDRESS_TYPE_VSOCK:
-        return g_strdup_printf("tcp:%s:%s",
+        return g_strdup_printf("vsock:%s:%s",
                                addr->u.vsock.cid,
                                addr->u.vsock.port);
     default: