pdu.c: remove iscsi_allocate_pdu_with_itt_flags()

Remove iscsi_allocate_pdu() which is just a wrapper.
Rename iscsi_allocate_pdu_with_itt_flags() to iscsi_allocate_pdu()
and update all callers.

This only removes a wrapper function and contains no logic changes.

Signed-off-by: Ronnie Sahlberg <ronniesahlberg@gmail.com>

lib/discovery.c

@@ -46,7 +46,9 @@ iscsi_discovery_async(struct iscsi_context *iscsi, iscsi_command_cb cb,
 	}
 
 	pdu = iscsi_allocate_pdu(iscsi, ISCSI_PDU_TEXT_REQUEST,
-				 ISCSI_PDU_TEXT_RESPONSE);
+				 ISCSI_PDU_TEXT_RESPONSE,
+				 iscsi_itt_post_increment(iscsi),
+				 0);
 	if (pdu == NULL) {
 		iscsi_set_error(iscsi, "Out-of-memory: Failed to allocate "
 				"text pdu.");