ensure dom_implementation_create_document_type() parameters are present (coverity 1127076)
ensure dom_implementation_create_document_type() parameters are present (coverity 1127076)

Achal-Aggarwal/libdom,Achal-Aggarwal/libdom,Achal-Aggarwal/libdom,Achal-Aggarwal/libdom,prepare/netsurf_libdom,prepare/netsurf_libdom,Achal-Aggarwal/libdom,dunkelstern/libdom,prepare/netsurf_libdom,dunkelstern/libdom,dunkelstern/libdom,dunkelstern/libdom,Achal-Aggarwal/libdom,dunkelstern/libdom,prepare/netsurf_libdom,dunkelstern/libdom,prepare/netsurf_libdom,prepare/netsurf_libdom