tty: serial: icom: Use DEFINE_SPINLOCK() for spinlock

spinlock can be initialized automatically with DEFINE_SPINLOCK()
rather than explicitly calling spin_lock_init().

Signed-off-by: Zheng Yongjun <[e-mail]>
Link: https://lore.kernel.org/r/[e-mail]
Signed-off-by: Greg Kroah-Hartman <[e-mail]>

drivers/tty/serial/icom.c

···
 static LIST_HEAD(icom_adapter_head);
 
 /* spinlock for adapter initialization and changing adapter operations */
-static spinlock_t icom_lock;
+static DEFINE_SPINLOCK(icom_lock);
 
 #ifdef ICOM_TRACE
 static inline void trace(struct icom_port *icom_port, char *trace_pt,
···
 static int __init icom_init(void)
 {
 	int ret;
-
-	spin_lock_init(&icom_lock);
 
 	ret = uart_register_driver(&icom_uart_driver);
 	if (ret)