drm/xe: Fix build without debugfs

When CONFIG_DEBUG_FS is off, drivers/gpu/drm/xe/xe_gt_debugfs.o
is not built and build fails on some setups with:

	ld: drivers/gpu/drm/xe/xe_gt.o: in function `xe_fault_inject_gt_reset':
	drivers/gpu/drm/xe/xe_gt.h:27:(.text+0x1659): undefined reference to `gt_reset_failure'
	ld: drivers/gpu/drm/xe/xe_gt.h:27:(.text+0x1c16): undefined reference to `gt_reset_failure'
	collect2: error: ld returned 1 exit status

Do not use the gt_reset_failure attribute if debugfs is not enabled.

Fixes: 8f3013e ("drm/xe: Introduce fault injection for gt reset")
Cc: Himal Prasad Ghimiray <[email protected]>
Acked-by: Randy Dunlap <[email protected]>
Tested-by: Randy Dunlap <[email protected]>
Reviewed-by: Himal Prasad Ghimiray <[email protected]>
Link: https://lore.kernel.org/r/[email protected]
Signed-off-by: Lucas De Marchi <[email protected]>
(cherry picked from commit 4d3bbe9)
Signed-off-by: Thomas Hellström <[email protected]>

Author: lucasdemarchi

drivers/gpu/drm/xe/xe_gt.h

@@ -24,7 +24,7 @@
 extern struct fault_attr gt_reset_failure;
 static inline bool xe_fault_inject_gt_reset(void)
 {
-	return should_fail(&gt_reset_failure, 1);
+	return IS_ENABLED(CONFIG_DEBUG_FS) && should_fail(&gt_reset_failure, 1);
 }
 
 struct xe_gt *xe_gt_alloc(struct xe_tile *tile);