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guardname() fails to return a valid C identifier for arguments containing anything but [A-Za-z0-9_.-']. Fix that. Don't bother protecting ticklish identifiers; header guards are all-caps, and no ticklish identifiers are. Signed-off-by: Markus Armbruster <armbru@redhat.com> Reviewed-by: Marc-André Lureau <marcandre.lureau@redhat.com> Reviewed-by: Eric Blake <eblake@redhat.com> Message-Id: <20180211093607.27351-22-armbru@redhat.com> Reviewed-by: Michael Roth <mdroth@linux.vnet.ibm.com> Signed-off-by: Eric Blake <eblake@redhat.com>