upstream: Fix return value confusion in several functions (readdir,

download and fsync). These should return -1 on error, not a sftp status code.

patch from Petr Cerny in bz#2871

OpenBSD-Commit-ID: 651aa0220ad23c9167d9297a436162d741f97a09
diff --git a/sftp-client.c b/sftp-client.c
index 0b53a2e..dc4d8c4 100644
--- a/sftp-client.c
+++ b/sftp-client.c
@@ -1,4 +1,4 @@
-/* $OpenBSD: sftp-client.c,v 1.128 2017/11/28 21:10:22 dtucker Exp $ */
+/* $OpenBSD: sftp-client.c,v 1.129 2018/05/25 04:25:46 djm Exp $ */
 /*
  * Copyright (c) 2001-2004 Damien Miller <djm@openbsd.org>
  *
@@ -669,7 +669,7 @@
 		**dir = NULL;
 	}
 
-	return status;
+	return status == SSH2_FX_OK ? 0 : -1;
 }
 
 int
@@ -1019,7 +1019,7 @@
 	if (status != SSH2_FX_OK)
 		error("Couldn't sync file: %s", fx2txt(status));
 
-	return status;
+	return status == SSH2_FX_OK ? 0 : -1;
 }
 
 #ifdef notyet
@@ -1451,7 +1451,7 @@
 	sshbuf_free(msg);
 	free(handle);
 
-	return(status);
+	return status == SSH2_FX_OK ? 0 : -1;
 }
 
 static int