Missed lastinvite CSeq int to uint32_t change

from Review: https://reviewboard.asterisk.org/r/1699/



git-svn-id: https://origsvn.digium.com/svn/asterisk/branches/1.8@359809 65c4cc65-6c06-0410-ace0-fbb531ad65f3

channels/sip/include/sip.h

@@ -986,7 +986,7 @@ struct sip_pvt {
 	uint32_t init_icseq;                    /*!< Initial incoming seqno from first request */
 	ast_group_t callgroup;                  /*!< Call group */
 	ast_group_t pickupgroup;                /*!< Pickup group */
-	int lastinvite;                         /*!< Last Cseq of invite */
+	uint32_t lastinvite;                    /*!< Last seqno of invite */
 	struct ast_flags flags[3];              /*!< SIP_ flags */
 
 	/* boolean flags that don't belong in flags */