tty: hvc: Return proper error code from console ->setup() hook

For unifying console ->setup() handling, which is poorly documented,
return error code, rather than non-zero arbitrary number.

Signed-off-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
Reviewed-by: Petr Mladek <pmladek@suse.com>
Signed-off-by: Petr Mladek <pmladek@suse.com>
Link: https://lore.kernel.org/r/20200618164751.56828-5-andriy.shevchenko@linux.intel.com

drivers/tty/hvc/hvsi.c

@@ -1128,7 +1128,7 @@ static int __init hvsi_console_setup(struct console *console, char *options)
 	int ret;
 
 	if (console->index < 0 || console->index >= hvsi_count)
-		return -1;
+		return -EINVAL;
 	hp = &hvsi_ports[console->index];
 
 	/* give the FSP a chance to change the baud rate when we re-open */