fix call to _extract_signature_function()
fix call to _extract_signature_function()

willprice/weboob,nojhan/weboob-devel,RouxRC/weboob,laurent-george/weboob,willprice/weboob,sputnick-dev/weboob,sputnick-dev/weboob,laurent-george/weboob,nojhan/weboob-devel,RouxRC/weboob,nojhan/weboob-devel,sputnick-dev/weboob,RouxRC/weboob,laurent-george/weboob,willprice/weboob