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libauth: correctly terminate nsfile args with nil

--- a/sys/src/libauth/newns.c

+++ b/sys/src/libauth/newns.c

@@ -7,7 +7,6 @@

 enum

 {

-	NARG	= 15,		/* max number of arguments */

 	MAXARG	= 10*ANAMELEN,	/* max length of an argument */

 };

@@ -97,7 +96,7 @@

 nsfile(char *fn, Biobuf *b, AuthRpc *rpc, int dfd)

 {

 	int argc;

-	char *cmd, *argv[NARG+1], argbuf[MAXARG*NARG];

+	char *cmd, *argv[16], argbuf[MAXARG*16];

 	int cdroot;

 	cdroot = 0;

@@ -108,7 +107,7 @@

 			cmd++;

 		if(*cmd == '#')

 			continue;

-		argc = splitargs(cmd, argv, argbuf, NARG);

+		argc = splitargs(cmd, argv, argbuf, nelem(argv));

 		if(argc)

 			cdroot |= nsop(fn, argc, argv, rpc, dfd);

 	}

@@ -294,6 +293,7 @@

 			return 0;

 		unquote(argv[i]);

 	}

+	argv[n] = nil;

 	return n;

 }

-- 

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