leak tests: mark t3321-notes-stripspace.sh as leak-free

This test was leak-free when t3321 was originally introduced, but never
marked as such:

    $ rev="$(git log --format='%H' --reverse -1 -- t/t3321-notes-stripspace.sh)"
    $ git checkout $rev
    HEAD is now at c1d38aeea1 leak tests: mark t3321 as leak-free

    $ make SANITIZE=leak
    [...]

    $ make -C t GIT_TEST_PASSING_SANITIZE_LEAK=check GIT_TEST_OPTS=--immediate t3321-notes-stripspace.sh
    make: Entering directory '/home/ttaylorr/src/git/t'
    *** t3321-notes-stripspace.sh ***
    [...]
    # passed all 27 test(s)
    1..27
    make: Leaving directory '/home/ttaylorr/src/git/t'

Mark this test as leak-free accordingly.

Signed-off-by: Taylor Blau <[email protected]>

Author: ttaylorr

t/t3321-notes-stripspace.sh

@@ -5,6 +5,7 @@
 
 test_description='Test commit notes with stripspace behavior'
 
+TEST_PASSES_SANITIZE_LEAK=true
 . ./test-lib.sh
 
 MULTI_LF="$LF$LF$LF"