Use the return value of cb7210_allocate_private in calling code as
early return value in case of error.

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

v3:
- Split commit into smaller pieces
- Improve changelog
- Change `(retval < 0)` to `(retval)`

 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 e354666a5823..e9d5fd19b495 100644
--- a/drivers/gpib/cb7210/cb7210.c
+++ b/drivers/gpib/cb7210/cb7210.c
@@ -875,11 +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)
+		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