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IIO: industrialio-core: Checking NULL instead of IS_ERR for debugfs_c…
…reate_dir() If defined CONFIG_DEBUG_FS, debugfs_create_dir returns NULL on failure. Signed-off-by: Axel Lin <axel.lin@gmail.com> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
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