ACPI: button: Improve warning message regarding lid state

The warning message regarding an unexpected lid state printed by
acpi_lid_notify_state() is quite cryptic and there is no information
in it to indicate that it is about a platform firmware defect.  In
fact, it can only be understood after reading the comment below the
statement printing it.

For this reason, replace it with a more direct one including FW_BUG so
its connection to a firmware issue is clearer.

While at it, fix up a comment preceding the statement printing the
message in question.

Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
Link: https://patch.msgid.link/5084775.GXAFRqVoOG@rafael.j.wysocki

Author: rafaeljw

drivers/acpi/button.c

@@ -227,8 +227,8 @@ static int acpi_lid_notify_state(struct acpi_button *button, int state)
 				ms_to_ktime(lid_report_interval));
 	if (button->last_state == !!state &&
 	    ktime_after(ktime_get(), next_report)) {
-		/* Complain the buggy firmware */
-		pr_warn_once("The lid device is not compliant to SW_LID.\n");
+		/* Complain about the buggy firmware. */
+		pr_warn_once(FW_BUG "Unexpected lid state reported by firmware\n");
 
 		/*
 		 * Send the unreliable complement switch event: