bitbake: fetch/gitsm: Fix crash when using git LFS and submodules

Gitsm fetcher crashes when cloning a repository that contains LFS files.
This happens because the unpack method is called during download, but the
submodules have not been downloaded yet at this point.

This issue was introduced in this
commit: 977b7268bf

[YOCTO #14283]

(Bitbake rev: 26caedc4d2e9b5a0f1d57f9291754a7f6c5e437e)

Signed-off-by: Niels Avonds <niels@codebits.be>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>

bitbake/lib/bb/fetch2/git.py

@@ -398,7 +398,7 @@ class Git(FetchMethod):
             tmpdir = tempfile.mkdtemp(dir=d.getVar('DL_DIR'))
             try:
                 # Do the checkout. This implicitly involves a Git LFS fetch.
-                self.unpack(ud, tmpdir, d)
+                Git.unpack(self, ud, tmpdir, d)
 
                 # Scoop up a copy of any stuff that Git LFS downloaded. Merge them into
                 # the bare clonedir.