can: kvaser_usb: kvaser_usb_hydra: Use kzalloc for allocating only one element

Use kzalloc(...) rather than kcalloc(1, ...) since because the number of
elements we are specifying in this case is 1, kzalloc would accomplish the
same thing and we can simplify. Also refactor how we calculate the sizeof()
as checkstyle for kzalloc() prefers using the variable we are assigning
to versus the type of that variable for calculating the size to allocate.
Signed-off-by: Kenneth Lee <klee33@uw.edu>
Link: https://lore.kernel.org/all/20220807051656.1991446-1-klee33@uw.eduSigned-off-by: Marc Kleine-Budde <mkl@pengutronix.de>

drivers/net/can/usb/kvaser_usb/kvaser_usb_hydra.c

@@ -534,7 +534,7 @@ static int kvaser_usb_hydra_send_simple_cmd(struct kvaser_usb *dev,
 	struct kvaser_cmd *cmd;
 	int err;
 
-	cmd = kcalloc(1, sizeof(struct kvaser_cmd), GFP_KERNEL);
+	cmd = kzalloc(sizeof(*cmd), GFP_KERNEL);
 	if (!cmd)
 		return -ENOMEM;
 
@@ -573,7 +573,7 @@ kvaser_usb_hydra_send_simple_cmd_async(struct kvaser_usb_net_priv *priv,
 	struct kvaser_usb *dev = priv->dev;
 	int err;
 
-	cmd = kcalloc(1, sizeof(struct kvaser_cmd), GFP_ATOMIC);
+	cmd = kzalloc(sizeof(*cmd), GFP_ATOMIC);
 	if (!cmd)
 		return -ENOMEM;
 
@@ -694,7 +694,7 @@ static int kvaser_usb_hydra_map_channel(struct kvaser_usb *dev, u16 transid,
 	struct kvaser_cmd *cmd;
 	int err;
 
-	cmd = kcalloc(1, sizeof(struct kvaser_cmd), GFP_KERNEL);
+	cmd = kzalloc(sizeof(*cmd), GFP_KERNEL);
 	if (!cmd)
 		return -ENOMEM;
 
@@ -735,7 +735,7 @@ static int kvaser_usb_hydra_get_single_capability(struct kvaser_usb *dev,
 	int err;
 	int i;
 
-	cmd = kcalloc(1, sizeof(struct kvaser_cmd), GFP_KERNEL);
+	cmd = kzalloc(sizeof(*cmd), GFP_KERNEL);
 	if (!cmd)
 		return -ENOMEM;
 
@@ -1394,7 +1394,7 @@ kvaser_usb_hydra_frame_to_cmd_ext(const struct kvaser_usb_net_priv *priv,
 	u32 kcan_id;
 	u32 kcan_header;
 
-	cmd = kcalloc(1, sizeof(struct kvaser_cmd_ext), GFP_ATOMIC);
+	cmd = kzalloc(sizeof(*cmd), GFP_ATOMIC);
 	if (!cmd)
 		return NULL;
 
@@ -1468,7 +1468,7 @@ kvaser_usb_hydra_frame_to_cmd_std(const struct kvaser_usb_net_priv *priv,
 	u32 flags;
 	u32 id;
 
-	cmd = kcalloc(1, sizeof(struct kvaser_cmd), GFP_ATOMIC);
+	cmd = kzalloc(sizeof(*cmd), GFP_ATOMIC);
 	if (!cmd)
 		return NULL;
 
@@ -1533,7 +1533,7 @@ static int kvaser_usb_hydra_set_bittiming(struct net_device *netdev)
 	int sjw = bt->sjw;
 	int err;
 
-	cmd = kcalloc(1, sizeof(struct kvaser_cmd), GFP_KERNEL);
+	cmd = kzalloc(sizeof(*cmd), GFP_KERNEL);
 	if (!cmd)
 		return -ENOMEM;
 
@@ -1567,7 +1567,7 @@ static int kvaser_usb_hydra_set_data_bittiming(struct net_device *netdev)
 	int sjw = dbt->sjw;
 	int err;
 
-	cmd = kcalloc(1, sizeof(struct kvaser_cmd), GFP_KERNEL);
+	cmd = kzalloc(sizeof(*cmd), GFP_KERNEL);
 	if (!cmd)
 		return -ENOMEM;
 
@@ -1711,7 +1711,7 @@ static int kvaser_usb_hydra_get_software_details(struct kvaser_usb *dev)
 	u32 flags;
 	struct kvaser_usb_dev_card_data *card_data = &dev->card_data;
 
-	cmd = kcalloc(1, sizeof(struct kvaser_cmd), GFP_KERNEL);
+	cmd = kzalloc(sizeof(*cmd), GFP_KERNEL);
 	if (!cmd)
 		return -ENOMEM;
 
@@ -1851,7 +1851,7 @@ static int kvaser_usb_hydra_set_opt_mode(const struct kvaser_usb_net_priv *priv)
 		return -EINVAL;
 	}
 
-	cmd = kcalloc(1, sizeof(struct kvaser_cmd), GFP_KERNEL);
+	cmd = kzalloc(sizeof(*cmd), GFP_KERNEL);
 	if (!cmd)
 		return -ENOMEM;