EAP-FAST server: Remove unused assignment

Commit e8c08c9a363340c45baf8e13c758c99078bc0d8b ('EAP-FAST server: Fix
potential read-after-buffer (by one byte)') changed the while loop
design in a way that does not require the pos variable to be updated
anymore. Remove that unneeded code to clean up static analyzer warnings
about unused assignments.

Signed-off-by: Jouni Malinen <j@w1.fi>

src/eap_server/eap_server_fast.c

@@ -186,7 +186,6 @@ static int eap_fast_session_ticket_cb(void *ctx, const u8 *ticket, size_t len,
 
 		switch (*pos) {
 		case PAC_OPAQUE_TYPE_PAD:
-			pos = end;
 			goto done;
 		case PAC_OPAQUE_TYPE_KEY:
 			if (pos[1] != EAP_FAST_PAC_KEY_LEN) {