drm/xe: Remove fence check from send_tlb_invalidation

'fence' argument in send_tlb_invalidation cannot be NULL, remove
non-NULL check from send_tlb_invalidation.
Reported-by: kernel test robot <lkp@intel.com>
Reported-by: Dan Carpenter <dan.carpenter@linaro.org>
Closes: https://lore.kernel.org/r/202407231049.esig0Fkb-lkp@intel.com/
Fixes: 61ac0353 ("drm/xe: Drop xe_gt_tlb_invalidation_wait")
Signed-off-by: Matthew Brost <matthew.brost@intel.com>
Reviewed-by: Nirmoy Das <nirmoy.das@intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20240723190714.1744653-1-matthew.brost@intel.comSigned-off-by: Nirmoy Das <nirmoy.das@intel.com>

drivers/gpu/drm/xe/xe_gt_tlb_invalidation.c

@@ -182,7 +182,7 @@ static int send_tlb_invalidation(struct xe_guc *guc,
 	action[1] = seqno;
 	ret = xe_guc_ct_send_locked(&guc->ct, action, len,
 				    G2H_LEN_DW_TLB_INVALIDATE, 1);
-	if (!ret && fence) {
+	if (!ret) {
 		spin_lock_irq(&gt->tlb_invalidation.pending_lock);
 		/*
 		 * We haven't actually published the TLB fence as per
@@ -203,7 +203,7 @@ static int send_tlb_invalidation(struct xe_guc *guc,
 						   tlb_timeout_jiffies(gt));
 		}
 		spin_unlock_irq(&gt->tlb_invalidation.pending_lock);
-	} else if (ret < 0 && fence) {
+	} else if (ret < 0) {
 		__invalidation_fence_signal(xe, fence);
 	}
 	if (!ret) {