drm/qxl: replace idr_init() by idr_init_base()

idr_init() uses base 0 which is an invalid identifier for this driver.
The idr_alloc for this driver uses 1 as start value for ID range. The
new function idr_init_base allows IDR to set the ID lookup from base 1.
This avoids all lookups that otherwise starts from 0 since 0 is always
unused / available.

References: commit 6ce711f27500 ("idr: Make 1-based IDRs more efficient")

Signed-off-by: Deepak R Varma <[e-mail]>
Link: http://patchwork.freedesktop.org/patch/msgid/20201105185016.GA71797@localhost
Signed-off-by: Gerd Hoffmann <[e-mail]>

drivers/gpu/drm/qxl/qxl_kms.c

···
 		goto cursor_ring_free;
 	}
 
-	idr_init(&qdev->release_idr);
+	idr_init_base(&qdev->release_idr, 1);
 	spin_lock_init(&qdev->release_idr_lock);
 	spin_lock_init(&qdev->release_lock);
 
-	idr_init(&qdev->surf_id_idr);
+	idr_init_base(&qdev->surf_id_idr, 1);
 	spin_lock_init(&qdev->surf_id_idr_lock);
 
 	mutex_init(&qdev->async_io_mutex);