sae: remove double sc increment

The send confirm counter is incremented before calling sae_send_confirm
in all cases, but the function itself was also incrementing sc after
sending the packet. This isn't critical to the successful execution of
SAE as the AP just uses the sc value in the packet but it did violate
the 802.11 spec.

src/sae.c

@@ -468,8 +468,6 @@ static void sae_send_confirm(struct sae_sm *sm)
 	memcpy(ptr, confirm, 32);
 	ptr += 32;
 
-	sm->sc++;
-
 	sm->state = SAE_STATE_CONFIRMED;
 
 	sm->tx(sm->handshake->aa, body, 38, sm->user_data);