[PATCH] hw/vfio: cpr-iommufd: Fix wrong usage of migrate_add_blocker_modes

[Jim Shu]

The return value of API is 0 for success and negative error code for
failure. We'll check if the return value equals to 0.
Also, the MIG_MODE should be CPR_TRANSFER and CPR_EXEC instead
of 2 same bits.

The API usage is aligned with 'hw/vfio/cpr-legacy.c' after these 2
changes.

Fixes: 3ca0a0ab05c ("migration: Use bitset of MigMode instead of variable 
arguments")
Signed-off-by: Jim Shu <jim....@sifive.com>
---
 hw/vfio/cpr-iommufd.c | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/hw/vfio/cpr-iommufd.c b/hw/vfio/cpr-iommufd.c
index c244db88fbb..6758c73b6b9 100644
--- a/hw/vfio/cpr-iommufd.c
+++ b/hw/vfio/cpr-iommufd.c
@@ -159,8 +159,8 @@ bool vfio_iommufd_cpr_register_iommufd(IOMMUFDBackend *be, 
Error **errp)
 
     if (!vfio_cpr_supported(be, cpr_blocker)) {
         return migrate_add_blocker_modes(cpr_blocker,
-                    BIT(MIG_MODE_CPR_TRANSFER) | BIT(MIG_MODE_CPR_TRANSFER),
-                    errp);
+                    BIT(MIG_MODE_CPR_TRANSFER) | BIT(MIG_MODE_CPR_EXEC),
+                    errp) == 0;
     }
 
     vmstate_register(NULL, -1, &iommufd_cpr_vmstate, be);
-- 
2.43.0