gentoo-overlay/dev-libs/libusb/files/libusb-1.0.25-fix-O3-warning.patch

https://github.com/libusb/libusb/pull/1062
https://github.com/libusb/libusb/issues/1063
https://bugs.gentoo.org/832732

From 8bb81fe72286cdcb782c7af4f0d7ef715b2e137c Mon Sep 17 00:00:00 2001
From: Yegor Yefremov <yegorslists@googlemail.com>
Date: Sun, 6 Feb 2022 07:12:14 +0100
Subject: [PATCH] linux_usbfs: fix maybe-uninitialized error
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Initialize active_config to an invalid value to avoid the following
compilation error:

os/linux_usbfs.c: In function ‘op_get_configuration’:
os/linux_usbfs.c:1452:12: error: ‘active_config’ may be used uninitialized in this function [-Werror=maybe-uninitialized]
 1452 |  *config = (uint8_t)active_config;

Signed-off-by: Yegor Yefremov <yegorslists@googlemail.com>
--- a/libusb/os/linux_usbfs.c
+++ b/libusb/os/linux_usbfs.c
@@ -1429,7 +1429,7 @@ static int op_get_configuration(struct libusb_device_handle *handle,
 	uint8_t *config)
 {
 	struct linux_device_priv *priv = usbi_get_device_priv(handle->dev);
-	int active_config;
+	int active_config = -1; /* to please compiler */
 	int r;
 
 	if (priv->sysfs_dir) {