t/README: reword the "GIT_TEST_PASSING_SANITIZE_LEAK" description

Reword the documentation added in 956d2e4 (tests: add a test mode
for SANITIZE=leak, run it in CI, 2021-09-23) for brevity.

The comment added in the same commit was also misleading: We skip
certain tests if SANITIZE=leak and GIT_TEST_PASSING_SANITIZE_LEAK=true,
not if we're compiled with SANITIZE=leak. Let's just remove the
comment, the control flow here is obvious enough that the code can
speak for itself.

Signed-off-by: Ævar Arnfjörð Bjarmason <[email protected]>
Signed-off-by: Junio C Hamano <[email protected]>

Author: avar

t/README

@@ -366,12 +366,10 @@ excluded as so much relies on it, but this might change in the future.
 GIT_TEST_SPLIT_INDEX=<boolean> forces split-index mode on the whole
 test suite. Accept any boolean values that are accepted by git-config.
 
-GIT_TEST_PASSING_SANITIZE_LEAK=<boolean> when compiled with
-SANITIZE=leak will run only those tests that have whitelisted
-themselves as passing with no memory leaks. Tests can be whitelisted
-by setting "TEST_PASSES_SANITIZE_LEAK=true" before sourcing
-"test-lib.sh" itself at the top of the test script. This test mode is
-used by the "linux-leaks" CI target.
+GIT_TEST_PASSING_SANITIZE_LEAK=true skips those tests that haven't
+declared themselves as leak-free by setting
+"TEST_PASSES_SANITIZE_LEAK=true" before sourcing "test-lib.sh". This
+test mode is used by the "linux-leaks" CI target.
 
 GIT_TEST_PROTOCOL_VERSION=<n>, when set, makes 'protocol.version'
 default to n.

t/test-lib.sh

@@ -1447,7 +1447,6 @@ then
 	test_done
 fi
 
-# skip non-whitelisted tests when compiled with SANITIZE=leak
 if test -n "$SANITIZE_LEAK"
 then
 	if test_bool_env GIT_TEST_PASSING_SANITIZE_LEAK false