epca: Add infinite break support

The EPCA can support indefinte break lengths and with info from digi that
can now be added

Signed-off-by: Alan Cox <[e-mail]>
Signed-off-by: Linus Torvalds <[e-mail]>

drivers/char/epca.c

···
 	unsigned long flags;
 
 	if (msec == -1)
-		return -EOPNOTSUPP;
+		msec = 0xFFFF;
+	else if (msec > 0xFFFE)
+		msec = 0xFFFE;
+	else if (msec < 1)
+		msec = 1;
 
 	spin_lock_irqsave(&epca_lock, flags);
 	globalwinon(ch);