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libsec: skip missing thumbprint files; not an error

--- a/sys/src/libsec/port/thumb.c

+++ b/sys/src/libsec/port/thumb.c

@@ -34,6 +34,8 @@

 {

 	Thumbprint *hd, *p;

+	if(table == nil)

+		return 0;

 	hd = tablehead(sum, table);

 	for(p = hd->next; p; p = p->next){

 		if(memcmp(sum, p->sha1, SHA1dlen) == 0)

@@ -52,6 +54,8 @@

 	uchar sum[SHA1dlen];

 	Biobuf *bin;

+	if(access(file, AEXIST) < 0)

+		return 0;	/* not an error */

 	if((bin = Bopen(file, OREAD)) == nil)

 		return -1;

 	for(; (line = Brdstr(bin, '\n', 1)) != nil; free(line)){

@@ -114,4 +118,3 @@

 	freeThumbprints(crltab);

 	return table;

 }

-