mfd: ab8500-debugfs: fix "between" in printk

fix spelling mistake, beetween -> between
Signed-off-by: NColin Ian King <colin.king@canonical.com>
Signed-off-by: NJiri Kosina <jkosina@suse.cz>

drivers/mfd/ab8500-debugfs.c

@@ -2563,7 +2563,7 @@ static ssize_t ab8500_gpadc_trig_timer_write(struct file *file,
 
 	if (user_trig_timer & ~0xFF) {
 		dev_err(dev,
-			"debugfs error input: should be beetween 0 to 255\n");
+			"debugfs error input: should be between 0 to 255\n");
 		return -EINVAL;
 	}