File xen.vhd_read_block.patch of Package xen

From: Olaf Hering <olaf@aepfle.de>
Date: Mon, 15 Jun 2020 20:51:50 +0200
Subject: vhd_read_block

libvhd.c: In function 'vhd_read_block':
libvhd.c:1876:14: error: 'end' may be used uninitialized in this function [-Werror=maybe-uninitialized]
 1876 |   size = end - off;

Signed-off-by: Olaf Hering <olaf@aepfle.de>
---
 tools/blktap2/vhd/lib/libvhd.c | 1 +
 1 file changed, 1 insertion(+)

--- a/tools/blktap2/vhd/lib/libvhd.c
+++ b/tools/blktap2/vhd/lib/libvhd.c
@@ -1833,24 +1833,25 @@ fail:
 	return err;
 }
 
 int
 vhd_read_block(vhd_context_t *ctx, uint32_t block, char **bufp)
 {
 	int err;
 	char *buf;
 	size_t size;
 	uint64_t blk;
 	off_t end, off;
 
+	end = 0;
 	buf   = NULL;
 	*bufp = NULL;
 
 	if (!vhd_type_dynamic(ctx))
 		return -EINVAL;
 
 	err = vhd_get_bat(ctx);
 	if (err)
 		return err;
 
 	if (block >= ctx->bat.entries)
 		return -ERANGE;