[RFC PATCH 01/12] vdpa: correct the VIRTIO_DEVICE_F_MASK example value

[Alexander Graf <graf@amazon.com>]

The comment above VIRTIO_DEVICE_F_MASK spells the mask out by hand as
0xfffffc000fffffff, which was correct while VIRTIO_TRANSPORT_F_END was
41. The bound is 42 now, so the macro expands to 0xfffff8000fffffff.
The comment is the only place we write the expansion out, so someone
checking a provisioned feature mask against it reads the wrong boundary
between transport and per-device bits.

The macro derives its value from the bound and needs no change, so
correct the comment.

Fixes: 838bebb4c926 ("virtio: Define feature bit for administration virtqueue")
Assisted-by: Kiro:claude-opus-5 checkpatch sparse
Signed-off-by: Alexander Graf <graf@amazon.com>
---
 drivers/vdpa/vdpa.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/vdpa/vdpa.c b/drivers/vdpa/vdpa.c
index 47c6c3d23f5c..1757a33f298f 100644
--- a/drivers/vdpa/vdpa.c
+++ b/drivers/vdpa/vdpa.c
@@ -548,7 +548,7 @@ vdpa_nl_cmd_mgmtdev_get_dumpit(struct sk_buff *msg, struct netlink_callback *cb)
 
 /*
  * Bitmask for all per-device features: feature bits VIRTIO_TRANSPORT_F_START
- * through VIRTIO_TRANSPORT_F_END are unset, i.e. 0xfffffc000fffffff for
+ * through VIRTIO_TRANSPORT_F_END are unset, i.e. 0xfffff8000fffffff for
  * all 64bit features. If the features are extended beyond 64 bits, or new
  * "holes" are reserved for other type of features than per-device, this
  * macro would have to be updated.