Return values for *allocate_private functions as well as calling code in
gpib driver are all over the place. Unify them by returning -errno if
something fails, zero otherwise. Use the returned value as early return
value in case of error. Replace kmalloc/memset pairs to kzalloc.

Signed-off-by: Dominik Karol Piątkowski <dominik.karol.piatkowski@protonmail.com>
---

v2: Replace kmalloc/memset pairs to kzalloc.

 drivers/gpib/cb7210/cb7210.c | 9 +++++----
 1 file changed, 5 insertions(+), 4 deletions(-)

diff --git a/drivers/gpib/cb7210/cb7210.c b/drivers/gpib/cb7210/cb7210.c
index 24c61b151071..6395f89d0f3c 100644
--- a/drivers/gpib/cb7210/cb7210.c
+++ b/drivers/gpib/cb7210/cb7210.c
@@ -856,11 +856,10 @@ static int cb7210_allocate_private(struct gpib_board *board)
 {
 	struct cb7210_priv *priv;
 
-	board->private_data = kmalloc(sizeof(struct cb7210_priv), GFP_KERNEL);
+	board->private_data = kzalloc(sizeof(struct cb7210_priv), GFP_KERNEL);
 	if (!board->private_data)
 		return -ENOMEM;
 	priv = board->private_data;
-	memset(priv, 0, sizeof(struct cb7210_priv));
 	init_nec7210_private(&priv->nec7210_priv);
 	return 0;
 }
@@ -876,11 +875,13 @@ static int cb7210_generic_attach(struct gpib_board *board)
 {
 	struct cb7210_priv *cb_priv;
 	struct nec7210_priv *nec_priv;
+	int retval;
 
 	board->status = 0;
 
-	if (cb7210_allocate_private(board))
-		return -ENOMEM;
+	retval = cb7210_allocate_private(board);
+	if (retval < 0)
+		return retval;
 	cb_priv = board->private_data;
 	nec_priv = &cb_priv->nec7210_priv;
 	nec_priv->read_byte = nec7210_locking_ioport_read_byte;
-- 
2.43.0