[v5 2/2] virtio-gpu: use consistent error checking for virtio_gpu_create_mapping_iov

[Honglei Huang <honghuan@amd.com>]

Unify error checking style for virtio_gpu_create_mapping_iov() across the
codebase to improve consistency and readability.

virtio_gpu_create_mapping_iov() returns 0 on success and negative values
on error. The original code used inconsistent patterns for checking errors:
- Some used 'if (ret != 0)'
- Some used 'CHECK(!ret, cmd)'
- Some used 'CHECK(!result, cmd)'

Change all checks to use the consistent 'if (ret < 0)' or 'CHECK(ret >= 0)'
patterns, following the preferred QEMU coding convention for functions that
return 0 on success and negative on error. This makes the return value
convention immediately clear to code readers without needing to look up
the function definition.

Updated locations:
- hw/display/virtio-gpu-virgl.c: virgl_resource_attach_backing()
- hw/display/virtio-gpu.c: virtio_gpu_resource_create_blob()
- hw/display/virtio-gpu.c: virtio_gpu_resource_attach_backing()
- hw/display/virtio-gpu-rutabaga.c: rutabaga_cmd_attach_backing()
- hw/display/virtio-gpu-rutabaga.c: rutabaga_cmd_resource_create_blob()

Signed-off-by: Honglei Huang <honghuan@amd.com>
Reviewed-by: Markus Armbruster <armbru@redhat.com>
---
 hw/display/virtio-gpu-rutabaga.c | 4 ++--
 hw/display/virtio-gpu-virgl.c    | 4 ++--
 hw/display/virtio-gpu.c          | 4 ++--
 3 files changed, 6 insertions(+), 6 deletions(-)

diff --git a/hw/display/virtio-gpu-rutabaga.c b/hw/display/virtio-gpu-rutabaga.c
index ed5ae52acb..ea2928b706 100644
--- a/hw/display/virtio-gpu-rutabaga.c
+++ b/hw/display/virtio-gpu-rutabaga.c
@@ -466,7 +466,7 @@ rutabaga_cmd_attach_backing(VirtIOGPU *g, struct virtio_gpu_ctrl_command *cmd)
 
     ret = virtio_gpu_create_mapping_iov(g, att_rb.nr_entries, sizeof(att_rb),
                                         cmd, NULL, &res->iov, &res->iov_cnt);
-    CHECK(!ret, cmd);
+    CHECK(ret >= 0, cmd);
 
     vecs.iovecs = res->iov;
     vecs.num_iovecs = res->iov_cnt;
@@ -616,7 +616,7 @@ rutabaga_cmd_resource_create_blob(VirtIOGPU *g,
         result = virtio_gpu_create_mapping_iov(g, cblob.nr_entries,
                                                sizeof(cblob), cmd, &res->addrs,
                                                &res->iov, &res->iov_cnt);
-        CHECK(!result, cmd);
+        CHECK(result >= 0, cmd);
     }
 
     rc_blob.blob_id = cblob.blob_id;
diff --git a/hw/display/virtio-gpu-virgl.c b/hw/display/virtio-gpu-virgl.c
index e60e1059df..6ebd9293e5 100644
--- a/hw/display/virtio-gpu-virgl.c
+++ b/hw/display/virtio-gpu-virgl.c
@@ -557,7 +557,7 @@ static void virgl_resource_attach_backing(VirtIOGPU *g,
 
     ret = virtio_gpu_create_mapping_iov(g, att_rb.nr_entries, sizeof(att_rb),
                                         cmd, NULL, &res_iovs, &res_niov);
-    if (ret != 0) {
+    if (ret < 0) {
         cmd->error = VIRTIO_GPU_RESP_ERR_UNSPEC;
         return;
     }
@@ -701,7 +701,7 @@ static void virgl_cmd_resource_create_blob(VirtIOGPU *g,
         ret = virtio_gpu_create_mapping_iov(g, cblob.nr_entries, sizeof(cblob),
                                             cmd, &res->base.addrs,
                                             &res->base.iov, &res->base.iov_cnt);
-        if (ret != 0) {
+        if (ret < 0) {
             cmd->error = VIRTIO_GPU_RESP_ERR_UNSPEC;
             return;
         }
diff --git a/hw/display/virtio-gpu.c b/hw/display/virtio-gpu.c
index 0a1a625b0e..1038c6a49f 100644
--- a/hw/display/virtio-gpu.c
+++ b/hw/display/virtio-gpu.c
@@ -352,7 +352,7 @@ static void virtio_gpu_resource_create_blob(VirtIOGPU *g,
     ret = virtio_gpu_create_mapping_iov(g, cblob.nr_entries, sizeof(cblob),
                                         cmd, &res->addrs, &res->iov,
                                         &res->iov_cnt);
-    if (ret != 0) {
+    if (ret < 0) {
         cmd->error = VIRTIO_GPU_RESP_ERR_UNSPEC;
         g_free(res);
         return;
@@ -931,7 +931,7 @@ virtio_gpu_resource_attach_backing(VirtIOGPU *g,
 
     ret = virtio_gpu_create_mapping_iov(g, ab.nr_entries, sizeof(ab), cmd,
                                         &res->addrs, &res->iov, &res->iov_cnt);
-    if (ret != 0) {
+    if (ret < 0) {
         cmd->error = VIRTIO_GPU_RESP_ERR_UNSPEC;
         return;
     }
-- 
2.34.1