fixup! Introduce helper to create symlinks that knows about index_state

We do not actually need to test for `state != NULL`, as
`state->delayed_checkout` had already been accessed before this.

Signed-off-by: Johannes Schindelin <johannes.schindelin@gmx.de>

Author: dscho

entry.c

@@ -289,7 +289,7 @@ static int write_entry(struct cache_entry *ce,
 		if (!has_symlinks || to_tempfile)
 			goto write_file_entry;
 
-		ret = create_symlink(state ? state->istate : NULL, new_blob, path);
+		ret = create_symlink(state->istate, new_blob, path);
 		free(new_blob);
 		if (ret)
 			return error_errno("unable to create symlink %s", path);