vduse: moving kvfree into caller

This free action should be moved into caller 'vduse_ioctl' in
concert with the allocation.

No functional change.
Signed-off-by: Guanjun <guanjun@linux.alibaba.com>
Link: https://lore.kernel.org/r/1638780498-55571-1-git-send-email-guanjun@linux.alibaba.comSigned-off-by: Michael S. Tsirkin <mst@redhat.com>

drivers/vdpa/vdpa_user/vduse_dev.c

@@ -1357,7 +1357,6 @@ static int vduse_create_dev(struct vduse_dev_config *config,
 err_str:
 	vduse_dev_destroy(dev);
 err:
-	kvfree(config_buf);
 	return ret;
 }
 
@@ -1408,6 +1407,8 @@ static long vduse_ioctl(struct file *file, unsigned int cmd,
 		}
 		config.name[VDUSE_NAME_MAX - 1] = '\0';
 		ret = vduse_create_dev(&config, buf, control->api_version);
+		if (ret)
+			kvfree(buf);
 		break;
 	}
 	case VDUSE_DESTROY_DEV: {