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.

Signed-off-by: Dominik Karol Piątkowski <dominik.karol.piatkowski@protonmail.com>
---
 drivers/gpib/cb7210/cb7210.c | 6 ++++--
 1 file changed, 4 insertions(+), 2 deletions(-)

diff --git a/drivers/gpib/cb7210/cb7210.c b/drivers/gpib/cb7210/cb7210.c
index 24c61b151071..e0ce2ac494c4 100644
--- a/drivers/gpib/cb7210/cb7210.c
+++ b/drivers/gpib/cb7210/cb7210.c
@@ -876,11 +876,13 @@ 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