net: wwan: iosm: Fix return type of ipc_wwan_link_transmit

The ndo_start_xmit field in net_device_ops is expected to be of type
netdev_tx_t (*ndo_start_xmit)(struct sk_buff *skb, struct net_device *dev).

The mismatched return type breaks forward edge kCFI since the underlying
function definition does not match the function hook definition.

The return type of ipc_wwan_link_transmit should be changed from int to
netdev_tx_t.
Reported-by: Dan Carpenter <error27@gmail.com>
Link: https://github.com/ClangBuiltLinux/linux/issues/1703
Cc: llvm@lists.linux.dev
Signed-off-by: Nathan Huckleberry <nhuck@google.com>
Acked-by: Sergey Ryazanov <ryazanov.s.a@gmail.com>
Link: https://lore.kernel.org/r/20220912214455.929028-1-nhuck@google.comSigned-off-by: Jakub Kicinski <kuba@kernel.org>

drivers/net/wwan/iosm/iosm_ipc_wwan.c

@@ -103,7 +103,7 @@ static int ipc_wwan_link_stop(struct net_device *netdev)
 }
 
 /* Transmit a packet */
-static int ipc_wwan_link_transmit(struct sk_buff *skb,
+static netdev_tx_t ipc_wwan_link_transmit(struct sk_buff *skb,
 					  struct net_device *netdev)
 {
 	struct iosm_netdev_priv *priv = wwan_netdev_drvpriv(netdev);