linux_usbfs: Fix maybe-uninitialized error with -O3

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;

Closes #1062
Closes #1063

Signed-off-by: Yegor Yefremov <yegorslists@googlemail.com>
diff --git a/libusb/os/linux_usbfs.c b/libusb/os/linux_usbfs.c
index c300675..285d9ca 100644
--- a/libusb/os/linux_usbfs.c
+++ b/libusb/os/linux_usbfs.c
@@ -1429,7 +1429,7 @@
 	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) {
diff --git a/libusb/version_nano.h b/libusb/version_nano.h
index 2125a59..888e511 100644
--- a/libusb/version_nano.h
+++ b/libusb/version_nano.h
@@ -1 +1 @@
-#define LIBUSB_NANO 11696
+#define LIBUSB_NANO 11697