silly cast.

git-svn-id: http://svn.freeswitch.org/svn/freeswitch/trunk@4858 d0543943-73ff-0310-b7d9-9358b9ac24b2

src/mod/endpoints/mod_sofia/sofia_presence.c

@@ -583,7 +583,7 @@ static int sofia_presence_mwi_callback(void *pArg, int argc, char **argv, char *
 	assert(nh != NULL);
 
 	id = switch_mprintf("sip:%s@%s", sub_to_user, sub_to_host);
-	expire_sec -= time(NULL);
+	expire_sec = (int)(expire_sec - time(NULL));
 	if (expire_sec < 0) {
 		expire_sec = 3600;
 	}