[PATCH 2/2] qemu-img: free memory before re-assign

[Pan Nengyuan]

collect_image_check() is called twice in img_check(), the filename/format will 
be alloced without free the original memory.
It is not a big deal since the process will exit anyway, but seems like a clean 
code and it will remove the warning spotted by asan.

Reported-by: Euler Robot <euler.ro...@huawei.com>
Signed-off-by: Pan Nengyuan <pannengy...@huawei.com>
---
 qemu-img.c | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/qemu-img.c b/qemu-img.c
index 2b4562b9d9..bcbca6c9a2 100644
--- a/qemu-img.c
+++ b/qemu-img.c
@@ -638,6 +638,8 @@ static int collect_image_check(BlockDriverState *bs,
         return ret;
     }
 
+    g_free(check->filename);
+    g_free(check->format);
     check->filename                 = g_strdup(filename);
     check->format                   = g_strdup(bdrv_get_format_name(bs));
     check->check_errors             = result.check_errors;
-- 
2.18.2