drm/xe/queue: fix engine_class bounds check

The engine_class is the index into the user_to_xe_engine_class,
therefore it needs to be less than.

Fixes: dd08ebf ("drm/xe: Introduce a new DRM driver for Intel GPUs")
Signed-off-by: Matthew Auld <matthew.auld@intel.com>
Cc: Nirmoy Das <nirmoy.das@intel.com>
Reviewed-by: Nirmoy Das <nirmoy.das@intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20240318180532.57522-4-matthew.auld@intel.com
(cherry picked from commit fe87b7d)
Signed-off-by: Lucas De Marchi <lucas.demarchi@intel.com>

Author: matt-auld

drivers/gpu/drm/xe/xe_exec_queue.c

@@ -448,7 +448,7 @@ find_hw_engine(struct xe_device *xe,
 {
 	u32 idx;
 
-	if (eci.engine_class > ARRAY_SIZE(user_to_xe_engine_class))
+	if (eci.engine_class >= ARRAY_SIZE(user_to_xe_engine_class))
 		return NULL;
 
 	if (eci.gt_id >= xe->info.gt_count)