drm/panthor: Fix off by one in panthor_fw_get_cs_iface()

The ->iface.streams[csg_slot][] array has MAX_CS_PER_CSG elements so
this > comparison needs to be >= to prevent an out of bounds access.

Fixes: 2718d91 ("drm/panthor: Add the FW logical block")
Signed-off-by: Dan Carpenter <dan.carpenter@linaro.org>
Reviewed-by: Boris Brezillon <boris.brezillon@collabora.com>
Signed-off-by: Boris Brezillon <boris.brezillon@collabora.com>
Link: https://patchwork.freedesktop.org/patch/msgid/62835c16-c85c-483d-a8fe-63be78d49d15@moroto.mountain

Author: Dan Carpenter

drivers/gpu/drm/panthor/panthor_fw.c

@@ -308,7 +308,7 @@ panthor_fw_get_csg_iface(struct panthor_device *ptdev, u32 csg_slot)
 struct panthor_fw_cs_iface *
 panthor_fw_get_cs_iface(struct panthor_device *ptdev, u32 csg_slot, u32 cs_slot)
 {
-	if (drm_WARN_ON(&ptdev->base, csg_slot >= MAX_CSGS || cs_slot > MAX_CS_PER_CSG))
+	if (drm_WARN_ON(&ptdev->base, csg_slot >= MAX_CSGS || cs_slot >= MAX_CS_PER_CSG))
 		return NULL;
 
 	return &ptdev->fw->iface.streams[csg_slot][cs_slot];