Merge branch 'rs/t3700-clean-leftover' into maint

A test fix.

* rs/t3700-clean-leftover:
  t3700: fix broken test under !POSIXPERM

Author: gitster

t/t3700-add.sh

@@ -356,6 +356,7 @@ test_expect_success POSIXPERM,SYMLINKS 'git add --chmod=+x with symlinks' '
 
 test_expect_success 'git add --chmod=[+-]x changes index with already added file' '
 	rm -f foo3 xfoo3 &&
+	git reset --hard &&
 	echo foo >foo3 &&
 	git add foo3 &&
 	git add --chmod=+x foo3 &&