debugdeltachain: cleanup the double call to _slicechunk
Follow-up to Yuya's review on
43154a76f3927c4f0c8c6b02be80f0069c7d8fdb:
> Nit: hasattr() isn't necessary. revlog._slicechunk() is used in the previous
> block.
hasattr() isn't necessary indeed, as we are protected by the withsparseread
option, which was introduced at the same time as revlog._slicechunk, in
e2ad93bcc084b97c48f54c179365376edb702858.
And, as Yuya noticed, _slicechunk could be called only once.
#require symlink
https://bz.mercurial-scm.org/1438
$ hg init
$ ln -s foo link
$ hg add link
$ hg ci -mbad link
$ hg rm link
$ hg ci -mok
$ hg diff -g -r 0:1 > bad.patch
$ hg up 0
1 files updated, 0 files merged, 0 files removed, 0 files unresolved
$ hg import --no-commit bad.patch
applying bad.patch
$ hg status
R link
? bad.patch