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/gpio/gpib_bitbang.c | 9 +++++----
 1 file changed, 5 insertions(+), 4 deletions(-)

diff --git a/drivers/gpib/gpio/gpib_bitbang.c b/drivers/gpib/gpio/gpib_bitbang.c
index 374cd61355e9..3b8bd34f2f3d 100644
--- a/drivers/gpib/gpio/gpib_bitbang.c
+++ b/drivers/gpib/gpio/gpib_bitbang.c
@@ -1068,7 +1068,7 @@ static int allocate_private(struct gpib_board *board)
 {
 	board->private_data = kzalloc(sizeof(struct bb_priv), GFP_KERNEL);
 	if (!board->private_data)
-		return -1;
+		return -ENOMEM;
 	return 0;
 }
 
@@ -1205,14 +1205,15 @@ static void bb_detach(struct gpib_board *board)
 static int bb_attach(struct gpib_board *board, const struct gpib_board_config *config)
 {
 	struct bb_priv *priv;
-	int retval = 0;
+	int retval;
 
 	dbg_printk(2, "%s\n", "Enter ...");
 
 	board->status = 0;
 
-	if (allocate_private(board))
-		return -ENOMEM;
+	retval = allocate_private(board);
+	if (retval < 0)
+		return retval;
 	priv = board->private_data;
 	priv->direction = -1;
 	priv->t1_delay = 2000;
-- 
2.43.0