JBD2/Ext4: Convert kmalloc to kzalloc in jbd2/ext4

Convert kmalloc to kzalloc() and get rid of the memset().

Signed-off-by: Mingming Cao <cmm@us.ibm.com>
diff --git a/fs/jbd2/journal.c b/fs/jbd2/journal.c
index 0e329a3..f12c65b 100644
--- a/fs/jbd2/journal.c
+++ b/fs/jbd2/journal.c
@@ -654,10 +654,9 @@
 	journal_t *journal;
 	int err;
 
-	journal = kmalloc(sizeof(*journal), GFP_KERNEL);
+	journal = kzalloc(sizeof(*journal), GFP_KERNEL|__GFP_NOFAIL);
 	if (!journal)
 		goto fail;
-	memset(journal, 0, sizeof(*journal));
 
 	init_waitqueue_head(&journal->j_wait_transaction_locked);
 	init_waitqueue_head(&journal->j_wait_logspace);
diff --git a/fs/jbd2/transaction.c b/fs/jbd2/transaction.c
index a5fb70f..b1fcf2b 100644
--- a/fs/jbd2/transaction.c
+++ b/fs/jbd2/transaction.c
@@ -96,13 +96,12 @@
 
 alloc_transaction:
 	if (!journal->j_running_transaction) {
-		new_transaction = kmalloc(sizeof(*new_transaction),
+		new_transaction = kzalloc(sizeof(*new_transaction),
 						GFP_NOFS|__GFP_NOFAIL);
 		if (!new_transaction) {
 			ret = -ENOMEM;
 			goto out;
 		}
-		memset(new_transaction, 0, sizeof(*new_transaction));
 	}
 
 	jbd_debug(3, "New handle %p going live.\n", handle);