fs: use kmem_cache_zalloc instead

Signed-off-by: Denis Cheng <crquan@gmail.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
diff --git a/fs/file_table.c b/fs/file_table.c
index 287fdce..ce3f39a 100644
--- a/fs/file_table.c
+++ b/fs/file_table.c
@@ -102,12 +102,11 @@
 			goto over;
 	}
 
-	f = kmem_cache_alloc(filp_cachep, GFP_KERNEL);
+	f = kmem_cache_zalloc(filp_cachep, GFP_KERNEL);
 	if (f == NULL)
 		goto fail;
 
 	percpu_counter_inc(&nr_files);
-	memset(f, 0, sizeof(*f));
 	if (security_file_alloc(f))
 		goto fail_sec;