kasan-fix-warnings-caused-by-use-of-arch_enter_lazy_mmu_mode-fix

fix s390 build

Reported-by: kernel test robot <lkp@intel.com>
Closes: https://lore.kernel.org/oe-kbuild-all/202509131255.x9EfvIGt-lkp@intel.com/
Cc: Alexander Gordeev <agordeev@linux.ibm.com>
Cc: Andrey Ryabinin <ryabinin.a.a@gmail.com>
Cc: Balbir Singh <balbirs@nvidia.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
diff --git a/mm/kasan/shadow.c b/mm/kasan/shadow.c
index af2684d..11d472a 100644
--- a/mm/kasan/shadow.c
+++ b/mm/kasan/shadow.c
@@ -319,7 +319,7 @@ static int kasan_populate_vmalloc_pte(pte_t *ptep, unsigned long addr,
 	}
 	spin_unlock(&init_mm.page_table_lock);
 
-	(void)arch_enter_lazy_mmu_mode();
+	arch_enter_lazy_mmu_mode();
 
 	return 0;
 }
@@ -494,7 +494,7 @@ static int kasan_depopulate_vmalloc_pte(pte_t *ptep, unsigned long addr,
 	if (likely(!none))
 		__free_page(pfn_to_page(pte_pfn(pte)));
 
-	(void)arch_enter_lazy_mmu_mode();
+	arch_enter_lazy_mmu_mode();
 
 	return 0;
 }