drm/xe/pf: Fix CFI failure in debugfs access

Reading debugfs file (/sys/kernel/debug/dri/0/gt*/pf/adverse_events)
with CFI (Control Flow Integrity) enabled, the kernel panics at
xe_gt_debugfs_simple_show+0x82/0xc0.

xe_gt_debugfs_simple_show() declare a function pointer expecting int
return type, but xe_gt_sriov_pf_monitor_print_events() is void return
type, leading to CFI failure and kernel panic.

[507620.973657] CFI failure at xe_gt_debugfs_simple_show+0x82/0xc0 [xe]
(target: xe_gt_sriov_pf_monitor_print_events+0x0/0x130 [xe]; expected
type: 0xd72c7139)

Fix xe_gt_sriov_pf_monitor_print_events() function by updating to return
an int type.

Fixes: 1c99d3d ("drm/xe/pf: Expose PF monitor details via debugfs")
Signed-off-by: Mohanram Meenakshisundaram <mohanram.meenakshisundaram@intel.com>
Reviewed-by: Michal Wajdeczko <michal.wajdeczko@intel.com>
Signed-off-by: Michal Wajdeczko <michal.wajdeczko@intel.com>
Link: https://patch.msgid.link/20260514174918.1556357-2-mohanram.meenakshisundaram@intel.com
(cherry picked from commit ff1d386)
Signed-off-by: Rodrigo Vivi <rodrigo.vivi@intel.com>

Author: mmeenaks-gh

drivers/gpu/drm/xe/xe_gt_sriov_pf_monitor.c

@@ -114,8 +114,10 @@ int xe_gt_sriov_pf_monitor_process_guc2pf(struct xe_gt *gt, const u32 *msg, u32
  * VFs with no events are not printed.
  *
  * This function can only be called on PF.
+ *
+ * Return: always 0
  */
-void xe_gt_sriov_pf_monitor_print_events(struct xe_gt *gt, struct drm_printer *p)
+int xe_gt_sriov_pf_monitor_print_events(struct xe_gt *gt, struct drm_printer *p)
 {
 	unsigned int n, total_vfs = xe_gt_sriov_pf_get_totalvfs(gt);
 	const struct xe_gt_sriov_monitor *data;
@@ -144,4 +146,6 @@ void xe_gt_sriov_pf_monitor_print_events(struct xe_gt *gt, struct drm_printer *p
 #undef __format
 #undef __value
 	}
+
+	return 0;
 }

drivers/gpu/drm/xe/xe_gt_sriov_pf_monitor.h

@@ -13,7 +13,7 @@ struct drm_printer;
 struct xe_gt;
 
 void xe_gt_sriov_pf_monitor_flr(struct xe_gt *gt, u32 vfid);
-void xe_gt_sriov_pf_monitor_print_events(struct xe_gt *gt, struct drm_printer *p);
+int xe_gt_sriov_pf_monitor_print_events(struct xe_gt *gt, struct drm_printer *p);
 
 #ifdef CONFIG_PCI_IOV
 int xe_gt_sriov_pf_monitor_process_guc2pf(struct xe_gt *gt, const u32 *msg, u32 len);