Merge branch 'jc/range-diff-lazy-setup'

Code clean-up.

* jc/range-diff-lazy-setup:
  remerge-diff: clean up temporary objdir at a central place
  remerge-diff: lazily prepare temporary objdir on demand

builtin/describe.c

@@ -716,7 +716,7 @@ int cmd_describe(int argc, const char **argv, const char *prefix)
 				BUG("malformed internal diff-index command line");
 			run_diff_index(&revs, 0);
 
-			if (!diff_result_code(&revs.diffopt))
+			if (!diff_result_code(&revs))
 				suffix = NULL;
 			else
 				suffix = dirty;