If the malloc above fails, the btrfs-image will exit directly
without any error messages.
Now just return the ENOMEM errno and let the caller prompt the
error message.

Signed-off-by: Gui Hecheng <guihc.f...@cn.fujitsu.com>
---
 btrfs-image.c | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/btrfs-image.c b/btrfs-image.c
index 2d482c3..e0aabfd 100644
--- a/btrfs-image.c
+++ b/btrfs-image.c
@@ -2421,7 +2421,8 @@ static int update_disk_super_on_device(struct 
btrfs_fs_info *info,
        buf = malloc(BTRFS_SUPER_INFO_SIZE);
        if (!buf) {
                ret = -ENOMEM;
-               exit(1);
+               close(fp);
+               return ret;
        }
 
        memcpy(buf, info->super_copy, BTRFS_SUPER_INFO_SIZE);
-- 
1.8.1.4

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