Input: gpio-keys - fix possible concurrent access in gpio_keys_irq_timer()

gpio_keys_irq_isr() and gpio_keys_irq_timer() access the same resources.
There could be a concurrent access if a GPIO interrupt occurs in parallel
of a HR timer interrupt.

Guard back those resources with a spinlock.

Fixes: 019002f20cb5 ("Input: gpio-keys - use hrtimer for release timer")
Signed-off-by: Gatien Chevallier <[e-mail]>
Link: https://lore.kernel.org/r/[e-mail]
Cc: [e-mail]
Signed-off-by: Dmitry Torokhov <[e-mail]>

drivers/input/keyboard/gpio_keys.c

···
 						      release_timer);
 	struct input_dev *input = bdata->input;
 
+	guard(spinlock_irqsave)(&bdata->lock);
+
 	if (bdata->key_pressed) {
 		input_report_key(input, *bdata->code, 0);
 		input_sync(input);