backends/iommufd: Get rid of qemu_open_old()

For qemu_open_old(), osdep.h said:

> Don't introduce new usage of this function, prefer the following
> qemu_open/qemu_create that take an "Error **errp".

So replace qemu_open_old() with qemu_open().

Cc: Yi Liu <[email protected]>
Cc: Eric Auger <[email protected]>
Cc: Zhenzhong Duan <[email protected]>
Signed-off-by: Zhao Liu <[email protected]>
Reviewed-by: Philippe Mathieu-Daudé <[email protected]>
Reviewed-by: Yi Liu <[email protected]>
Reviewed-by: Michael Tokarev <[email protected]>
Signed-off-by: Michael Tokarev <[email protected]>

backends/iommufd.c

@@ -77,9 +77,8 @@ bool iommufd_backend_connect(IOMMUFDBackend *be, Error **errp)
     int fd;
 
     if (be->owned && !be->users) {
-        fd = qemu_open_old("/dev/iommu", O_RDWR);
+        fd = qemu_open("/dev/iommu", O_RDWR, errp);
         if (fd < 0) {
-            error_setg_errno(errp, errno, "/dev/iommu opening failed");
             return false;
         }
         be->fd = fd;