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permind: fix permuted file generation from /sys/man (thanks dave)

The argument list of execl() must be terminated with NULL, not 0.

--- a/sys/lib/man/permind/ptx1.c

+++ b/sys/lib/man/permind/ptx1.c

@@ -241,7 +241,7 @@

 	if(fork()==0){

 		execl("/bin/sort", "sort", sortopt, "+0", "-1", "+1", "-o",

-			sortfile, sortfile, 0);

+			sortfile, sortfile, NULL);

 		diag("sort exec failed","");

 	}

 	if((w = wait()) == NULL || w->msg[0] != '\0')

@@ -252,7 +252,7 @@

 	if(fork()==0){

 		if(dup(create(wfile,OWRITE|OTRUNC,0666),1) == -1)

 			diag("Cannot create width file:",wfile);

-		execl(roff, roff, "-a", kfile, 0);

+		execl(roff, roff, "-a", kfile, NULL);

 		diag("troff exec failed","");

 	}

 	if((w = wait()) == NULL || w->msg[0] != '\0')

-- 

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