Useless or incorrect tests.
 [rsc] --rw-rw-r-- M 129339 glenda sys 9496 Dec 12 07:21 sys/src/9/ip/icmp.c
	/n/sourcesdump/2005/1212/plan9/sys/src/9/ip/icmp.c:369,375 - 
	/n/sourcesdump/2005/1213/plan9/sys/src/9/ip/icmp.c:369,375
	  		ipoput4(icmp->f, r, 0, MAXTTL, DFLTTOS, nil);
	  		break;
	  	case Unreachable:
	- 		if(p->code > 5 || p->code < 0)
	+ 		if(p->code > 5)
	  			msg = unreachcode[1];
	  		else
	  			msg = unreachcode[p->code];
 [rsc] --rw-rw-r-- M 129339 presotto sys 18083 Dec 12 07:21 sys/src/9/ip/icmp6.c
	/n/sourcesdump/2005/1212/plan9/sys/src/9/ip/icmp6.c:749,755 - 
	/n/sourcesdump/2005/1213/plan9/sys/src/9/ip/icmp6.c:749,755
	  		break;
	  
	  	case UnreachableV6:
	- 		if(p->code > 4 || p->code < 0)
	+ 		if(p->code > 4)
	  			msg = unreachcode[icmp6_unkn_code];
	  		else
	  			msg = unreachcode[p->code];
 [rsc] --rw-rw-r-- M 129339 glenda sys 26923 Dec 12 07:21 sys/src/9/ip/il.c
	/n/sourcesdump/2005/1212/plan9/sys/src/9/ip/il.c:563,569 - 
	/n/sourcesdump/2005/1213/plan9/sys/src/9/ip/il.c:563,569
	  	v4tov6(laddr, ih->dst);
	  
	  	if((csum = ptclcsum(bp, IL_IPSIZE, illen)) != 0) {
	- 		if(ih->iltype < 0 || ih->iltype > Ilclose)
	+ 		if(ih->iltype > Ilclose)
	  			st = "?";
	  		else
	  			st = iltype[ih->iltype];
	/n/sourcesdump/2005/1212/plan9/sys/src/9/ip/il.c:586,592 - 
	/n/sourcesdump/2005/1213/plan9/sys/src/9/ip/il.c:586,592
	  	if(ic->state == Illistening){
	  		if(ih->iltype != Ilsync){
	  			qunlock(il);
	- 			if(ih->iltype < 0 || ih->iltype > Ilclose)
	+ 			if(ih->iltype > Ilclose)
	  				st = "?";
	  			else
	  				st = iltype[ih->iltype];
 [rsc] --rw-rw-r-- M 129339 presotto sys 28760 Dec 12 07:22 sys/src/9/pc/etherga620.c
	/n/sourcesdump/2005/1212/plan9/sys/src/9/pc/etherga620.c:1056,1062 - 
	/n/sourcesdump/2005/1213/plan9/sys/src/9/pc/etherga620.c:1056,1062
	  static int
	  ga620reset(Ctlr* ctlr)
	  {
	- 	int cls, csr, i;
	+ 	int cls, csr, i, r;
	  
	  	if(ga620detach(ctlr) < 0)
	  		return -1;
	/n/sourcesdump/2005/1212/plan9/sys/src/9/pc/etherga620.c:1095,1102 - 
	/n/sourcesdump/2005/1213/plan9/sys/src/9/pc/etherga620.c:1095,1103
	  	 * Snarf the MAC address from the serial EEPROM.
	  	 */
	  	for(i = 0; i < Eaddrlen; i++){
	- 		if((ctlr->ea[i] = at24c32r(ctlr, 0x8E+i)) == -1)
	+ 		if((r = at24c32r(ctlr, 0x8E+i)) == -1)
	  			return -1;
	+ 		ctlr->ea[i] = r;
	  	}
	  
	  	/*
 [jmk] --rw-rw-r-- M 129339 glenda sys 2494 Dec 12 13:16 sys/src/9/port/sd.h
	/n/sourcesdump/2005/1212/plan9/sys/src/9/port/sd.h:25,31 - 
	/n/sourcesdump/2005/1213/plan9/sys/src/9/port/sd.h:25,31
	  struct SDunit {
	  	SDev*	dev;
	  	int	subno;
	- 	uchar	inquiry[256];		/* format follows SCSI spec */
	+ 	uchar	inquiry[255];		/* format follows SCSI spec */
	  	uchar	sense[18];		/* format follows SCSI spec */
	  	SDperm;