UBUNTU-CVE-2026-98528: Low severity ubuntu/linux-hwe-edge vulnerability

In the Linux kernel, the following vulnerability has been resolved: gpio: cdev: fix kernel stack leak to user-space in error path If we fail to acquire the GPIO chip guard in gpiodesctolineinfo(), we return immediately before zeroing the info struct we'll end up passing to the user-space later in lineinfogetv1(). This may leak the kernel stack contents. Make gpiodesctolineinfo() return int so that the -ENODEV returned on failure to acquire the guard can be propagated to the callers. While not strictly necessary: move the memset() before trying to acquire the SRCU read lock too for good measure.