config: fix leaking "core.notesref" variable

The variable used to track the "core.notesref" config is not getting
freed before we assign to it and thus leaks. Fix this.

Signed-off-by: Patrick Steinhardt <[email protected]>
Signed-off-by: Junio C Hamano <[email protected]>

Author: pks-t

config.c

@@ -1565,6 +1565,7 @@ static int git_default_core_config(const char *var, const char *value,
 	if (!strcmp(var, "core.notesref")) {
 		if (!value)
 			return config_error_nonbool(var);
+		free(notes_ref_name);
 		notes_ref_name = xstrdup(value);
 		return 0;
 	}

t/t3308-notes-merge.sh

@@ -5,6 +5,7 @@
 
 test_description='Test merging of notes trees'
 
+TEST_PASSES_SANITIZE_LEAK=true
 . ./test-lib.sh
 
 test_expect_success setup '

t/t3309-notes-merge-auto-resolve.sh

@@ -5,6 +5,7 @@
 
 test_description='Test notes merging with auto-resolving strategies'
 
+TEST_PASSES_SANITIZE_LEAK=true
 . ./test-lib.sh
 
 # Set up a notes merge scenario with all kinds of potential conflicts