diff.[ch]: have diff_free() free options->parseopts

The "struct option" added in 4a28847839 (diff.c: prepare to use
parse_options() for parsing, 2019-01-27) would be free'd in the case
of diff_setup_done() being called.

But not all codepaths that allocate it reach that,
e.g. "t6427-diff3-conflict-markers.sh" will now free memory that it
didn't free before. By using FREE_AND_NULL() here (which
diff_setup_done() also does) we ensure that we free the memory, and
that we won't have double-free's.

Before this running:

    ./t6427-diff3-conflict-markers.sh -vixd --run=7

Would report:

    SUMMARY: LeakSanitizer: 7823 byte(s) leaked in 6 allocation(s).

But now we'll report:

    SUMMARY: LeakSanitizer: 703 byte(s) leaked in 5 allocation(s).

I.e. the largest leak in that particular test has now been addressed.

Signed-off-by: Ævar Arnfjörð Bjarmason <avarab@gmail.com>
Reviewed-by: Elijah Newren <newren@gmail.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>

diff.c

@@ -6346,6 +6346,7 @@ void diff_free(struct diff_options *options)
 	diff_free_file(options);
 	diff_free_ignore_regex(options);
 	clear_pathspec(&options->pathspec);
+	FREE_AND_NULL(options->parseopts);
 }
 
 void diff_flush(struct diff_options *options)