fix portability issues with $ in double quotes

diff --git a/t/t4012-diff-binary.sh b/t/t4012-diff-binary.sh
index 3cf5b5c4ea05d861d75aa146a52d7d273dcaa4cb..bc46563afc607e6fba9acbd2773d88207c878981 100755 (executable)
--- a/t/t4012-diff-binary.sh
+++ b/t/t4012-diff-binary.sh
@@ -77,17 +77,13 @@ test_expect_success 'apply binary patch' \
         tree1=`git write-tree` &&
         test "$tree1" = "$tree0"'
 
-q_to_nul() {
-       perl -pe 'y/Q/\000/'
-}
-
 nul_to_q() {
        perl -pe 'y/\000/Q/'
 }
 
 test_expect_success 'diff --no-index with binary creation' '
        echo Q | q_to_nul >binary &&
-       (:# hide error code from diff, which just indicates differences
+       (: hide error code from diff, which just indicates differences
         git diff --binary --no-index /dev/null binary >current ||
         true
        ) &&