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The kernel doc for gpio-aggregator configfs interface, which was recently added, states that users should not be able to create an aggregator with a name prefixed by "_sysfs" via configfs. However, it was found that this guard does not function as expected (thanks to Dan Carpenter for identifying and fixing the issue). Add a test case to verify the guard. Signed-off-by: Koichiro Den <koichiro.den@canonical.com> Link: https://lore.kernel.org/r/20250412150119.1461023-1-koichiro.den@canonical.com Signed-off-by: Bartosz Golaszewski <brgl@bgdev.pl>