Make virtio_gpu_virgl_init() return -1 on error to make it consistent
with virtio_gpu_virgl_reset() in regards to error handling codding style,
adhering to QEMU's devel/style recommendations.

Signed-off-by: Dmitry Osipenko <dmitry.osipenko@collabora.com>
---
 hw/display/virtio-gpu-gl.c    | 2 +-
 hw/display/virtio-gpu-virgl.c | 4 ++--
 2 files changed, 3 insertions(+), 3 deletions(-)

diff --git a/hw/display/virtio-gpu-gl.c b/hw/display/virtio-gpu-gl.c
index bca7d489c1e3..d65da4863923 100644
--- a/hw/display/virtio-gpu-gl.c
+++ b/hw/display/virtio-gpu-gl.c
@@ -78,7 +78,7 @@ static void virtio_gpu_gl_handle_ctrl(VirtIODevice *vdev, VirtQueue *vq)
         }
         /* fallthrough */
     case RS_START:
-        if (virtio_gpu_virgl_init(g)) {
+        if (virtio_gpu_virgl_init(g) < 0) {
             gl->renderer_state = RS_INIT_FAILED;
             return;
         }
diff --git a/hw/display/virtio-gpu-virgl.c b/hw/display/virtio-gpu-virgl.c
index 24d329022da9..35201d629b9c 100644
--- a/hw/display/virtio-gpu-virgl.c
+++ b/hw/display/virtio-gpu-virgl.c
@@ -1357,7 +1357,7 @@ int virtio_gpu_virgl_init(VirtIOGPU *g)
              * Async-fence was bugged in virglrenderer versions <= 1.1.1.
              */
             error_report("drm requires egl display and virglrenderer >= 1.2.0");
-            return -EINVAL;
+            return -1;
         }
     }
 #endif
@@ -1365,7 +1365,7 @@ int virtio_gpu_virgl_init(VirtIOGPU *g)
     ret = virgl_renderer_init(g, flags, &virtio_gpu_3d_cbs);
     if (ret != 0) {
         error_report("virgl could not be initialized: %d", ret);
-        return ret;
+        return -1;
     }
 
     gl->fence_poll = timer_new_ms(QEMU_CLOCK_VIRTUAL,
-- 
2.51.1