Merge branch 'rj/xdiff-prepare-plug-leak-on-error-codepath'

A small memory leak in an error codepath has been plugged in xdiff code. * rj/xdiff-prepare-plug-leak-on-error-codepath: xdiff/xprepare: fix a memory leak xdiff/xprepare: use the XDF_DIFF_ALG() macro to access flag bits