[Qemu-trivial] [PULL 7/9] block: allow creation of fixed vhdx images

[Michael Tokarev]

From: Adelina Tuvenie <address@hidden>

When trying to create a fixed vhd image qemu-img will return the
following error:

 qemu-img: test.vhdx: Could not create image: Cannot allocate memory

This happens because of a incorrect check in vhdx.c. Specifficaly,
in vhdx_create_bat(), after allocating memory for the BAT entry,
there is a check to determine if the allocation was unsuccsessful.
The error comes from the fact that it checks if s->bat isn't NULL,
which is true in case of succsessful allocation,  and exits with
error ENOMEM.

Signed-off-by: Adelina Tuvenie <address@hidden>
Acked-by: Kevin Wolf <address@hidden>
Signed-off-by: Michael Tokarev <address@hidden>
---
 block/vhdx.c |    2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/block/vhdx.c b/block/vhdx.c
index 796b7bd..5bf292e 100644
--- a/block/vhdx.c
+++ b/block/vhdx.c
@@ -1593,7 +1593,7 @@ static int vhdx_create_bat(BlockDriverState *bs, 
BDRVVHDXState *s,
                 bdrv_has_zero_init(bs) == 0) {
         /* for a fixed file, the default BAT entry is not zero */
         s->bat = g_try_malloc0(length);
-        if (length && s->bat != NULL) {
+        if (length && s->bat == NULL) {
             ret = -ENOMEM;
             goto exit;
         }
-- 
1.7.10.4