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keyfs: print error message when reading /adm/keys fails

--- a/sys/src/cmd/auth/keyfs.c

+++ b/sys/src/cmd/auth/keyfs.c

@@ -771,15 +771,14 @@

 	/* write file */

 	fd = create(userkeys, OWRITE, 0660);

 	if(fd < 0){

+		fprint(2, "keyfs: can't write %s: %r\n", userkeys);

 		free(buf);

-		fprint(2, "keyfs: can't write keys file\n");

 		return;

 	}

 	if(write(fd, buf, p - buf) != (p - buf))

-		fprint(2, "keyfs: can't write keys file\n");

-

-	free(buf);

+		fprint(2, "keyfs: can't write %s: %r\n", userkeys);

 	close(fd);

+	free(buf);

 	newkeys();

 }

@@ -854,8 +853,10 @@

 	/* read file into an array */

 	fd = open(userkeys, OREAD);

-	if(fd < 0)

+	if(fd < 0){

+		fprint(2, "keyfs: can't read %s: %r\n", userkeys);

 		return 0;

+	}

 	d = dirfstat(fd);

 	if(d == nil){

 		close(fd);