Merge branch 'maint'

* maint:
  tests: fix "export var=val"
  Skip timestamp differences for diff --no-index
  Documentation/git-push: --all, --mirror, --tags can not be combined

diff-no-index.c

@@ -247,6 +247,7 @@ void diff_no_index(struct rev_info *revs,
 	else
 		revs->diffopt.paths = argv + argc - 2;
 	revs->diffopt.nr_paths = 2;
+	revs->diffopt.skip_stat_unmatch = 1;
 
 	DIFF_OPT_SET(&revs->diffopt, EXIT_WITH_STATUS);
 	DIFF_OPT_SET(&revs->diffopt, NO_INDEX);