DOMDocument: Actually free the empty memoised string
DOMDocument: Actually free the empty memoised string

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