net/socket/getsockname.c: Fix addrlen check in socket debug features. Getsockname checked erroneously a pointer agains 0, where the intention was to dereference the pointer and to check the length. This causes also a compilation failure if the code is compiled with CONFIG_DEBUG_FEATURES and with -Werror flag set.

net/socket/getsockname.c

@@ -105,7 +105,7 @@ int psock_getsockname(FAR struct socket *psock, FAR struct sockaddr *addr, FAR s
    */
 
 #ifdef CONFIG_DEBUG_FEATURES
-  if (addr == NULL || addrlen <= 0)
+  if (addr == NULL || *addrlen <= 0)
     {
       return -EINVAL;
     }