driver: tty: serial: remove cast for kzalloc return value

remove cast for kzalloc return value.

Signed-off-by: Zhang Yanfei <[e-mail]>
Cc: Jiri Slaby <[e-mail]>
Cc: Andrew Morton <[e-mail]>
Signed-off-by: Greg Kroah-Hartman <[e-mail]>

drivers/tty/serial/icom.c

···
 	struct icom_adapter *cur_adapter_entry;
 	struct list_head *tmp;
 
-	icom_adapter = (struct icom_adapter *)
-	    kzalloc(sizeof(struct icom_adapter), GFP_KERNEL);
+	icom_adapter = kzalloc(sizeof(struct icom_adapter), GFP_KERNEL);
 
 	if (!icom_adapter) {
 		return -ENOMEM;