Bugfix: when enforcing an external program's max time value, was comparing

timeleft (in seconds) with the configured max time (in minutes) and
setting the amount of time allowed in the door to max time, so a user
could easily get extra time in a door if the max time option was used.
Enforcing 15-bit time left (in seconds) cap for chain.txt (WWIV) doors, works
around doors that interpret this value as a signed 16-bit value.

src/sbbs3/xtrn_sec.cpp

@@ -448,6 +448,9 @@ void sbbs_t::xtrndat(char *name, char *dropdir, uchar type, ulong tleft
 			return; 
 		}
 
+		if(tleft>0x7fff)	/* Reduce time-left for broken 16-bit doors		*/
+			tleft=0x7fff;	/* That interpret this value as a signed short	*/
+
 		sprintf(str,"%u\n%s\n%s\n%s\n%u\n%c\n"
 			,useron.number						/* User number */
 			,name								/* User name */
@@ -1646,7 +1649,7 @@ bool sbbs_t::exec_xtrn(uint xtrnnum)
 
 	gettimeleft();
 	tleft=timeleft+(cfg.xtrn[xtrnnum]->textra*60);
-	if(cfg.xtrn[xtrnnum]->maxtime && tleft>cfg.xtrn[xtrnnum]->maxtime)
+	if(cfg.xtrn[xtrnnum]->maxtime && tleft>(cfg.xtrn[xtrnnum]->maxtime*60))
 		tleft=(cfg.xtrn[xtrnnum]->maxtime*60);
 	xtrndat(name,dropdir,cfg.xtrn[xtrnnum]->type,tleft,cfg.xtrn[xtrnnum]->misc);
 	if(!online)