storageutil: invert logic of file data comparison
IMO things make more sense when the function is explicitly a test
for file data equivalence.
Not bothering with API since the function was introduced by the
previous commit.
Differential Revision: https://phab.mercurial-scm.org/D4802
#require docutils gettext
$ $TESTDIR/check-gendoc de
checking for parse errors
Die Dateien werden dem Projektarchiv beim n\xc3\xa4chsten \xc3\x9cbernehmen (commit) hinzugef\xc3\xbcgt. Um dies vorher r\xc3\xbcckg\xc3\xa4ngig zu machen, siehe:hg:`forget`. (esc)
warning: please have a space before :hg: