tty: ehv_bytechan: convert to u8 and size_t

Switch character types to u8 and sizes to size_t. To conform to
characters/sizes in the rest of the tty layer.

Signed-off-by: "Jiri Slaby (SUSE)" <[e-mail]>
Cc: Laurentiu Tudor <[e-mail]>
Cc: [e-mail]
Link: https://lore.kernel.org/r/[e-mail]
Signed-off-by: Greg Kroah-Hartman <[e-mail]>

drivers/tty/ehv_bytechan.c

···
 	unsigned int tx_irq;
 
 	spinlock_t lock;	/* lock for transmit buffer */
-	unsigned char buf[BUF_SIZE];	/* transmit circular buffer */
+	u8 buf[BUF_SIZE];	/* transmit circular buffer */
 	unsigned int head;	/* circular buffer head */
 	unsigned int tail;	/* circular buffer tail */
 
···
 
 static unsigned int local_ev_byte_channel_send(unsigned int handle,
 					       unsigned int *count,
-					       const char *p)
+					       const u8 *p)
 {
-	char buffer[EV_BYTE_CHANNEL_MAX_BYTES];
+	u8 buffer[EV_BYTE_CHANNEL_MAX_BYTES];
 	unsigned int c = *count;
 
 	/*
···
  * has been sent, or if some error has occurred.
  *
  */
-static void byte_channel_spin_send(const char data)
+static void byte_channel_spin_send(const u8 data)
 {
 	int ret, count;
 
···
 {
 	struct ehv_bc_data *bc = ttys->driver_data;
 	unsigned long flags;
-	unsigned int len;
-	unsigned int written = 0;
+	size_t len, written = 0;
 
 	while (1) {
 		spin_lock_irqsave(&bc->lock, flags);