revisions API users: add straightforward release_revisions()

Add a release_revisions() to various users of "struct rev_list" in
those straightforward cases where we only need to add the
release_revisions() call to the end of a block, and don't need to
e.g. refactor anything to use a "goto cleanup" pattern.

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

remote.c

@@ -2172,6 +2172,7 @@ static int stat_branch_pair(const char *branch_name, const char *base,
 	clear_commit_marks(theirs, ALL_REV_FLAGS);
 
 	strvec_clear(&argv);
+	release_revisions(&revs);
 	return 1;
 }