tty: gdm724x: convert counts to size_t

Unify the type of tty_operations::write() counters with the 'count'
parameter. I.e. use size_t for them.

This includes changing constants to UL to keep min() and avoid min_t().

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

drivers/staging/gdm724x/gdm_tty.c

···
 #define GDM_TTY_MAJOR 0
 #define GDM_TTY_MINOR 32
 
-#define WRITE_SIZE 2048
+#define WRITE_SIZE 2048UL
 
-#define MUX_TX_MAX_SIZE 2048
+#define MUX_TX_MAX_SIZE 2048UL
 
 static inline bool gdm_tty_ready(struct gdm *gdm)
 {
···
 static ssize_t gdm_tty_write(struct tty_struct *tty, const u8 *buf, size_t len)
 {
 	struct gdm *gdm = tty->driver_data;
-	int remain = len;
-	int sent_len = 0;
-	int sending_len = 0;
+	size_t remain = len;
+	size_t sent_len = 0;
 
 	if (!gdm_tty_ready(gdm))
 		return -ENODEV;
···
 		return 0;
 
 	while (1) {
-		sending_len = min(MUX_TX_MAX_SIZE, remain);
+		size_t sending_len = min(MUX_TX_MAX_SIZE, remain);
 		gdm->tty_dev->send_func(gdm->tty_dev->priv_dev,
 					(void *)(buf + sent_len),
 					sending_len,