diff-no-index: release strbuf on queue error

The strbuf is small and we are about to exit, so we could leave its
cleanup to the OS.  If we release it explicitly at all, however, then we
should do it on early exit as well.  Move the strbuf_release call to a
new cleanup section at the end and make sure all execution paths go
through it.

Suggested-by: Johannes Schindelin <johannes.schindelin@gmx.de>
Signed-off-by: René Scharfe <l.s.r@web.de>
Signed-off-by: Junio C Hamano <gitster@pobox.com>

1 files changed, 7 insertions, 4 deletions

diff --git a/diff-no-index.c b/diff-no-index.c
index 9a8b09346b..a3683d8a04 100644
--- a/diff-no-index.c
+++ b/diff-no-index.c
@@ -243,6 +243,7 @@ int diff_no_index(struct rev_info *revs,
 		  int argc, const char **argv)
 {
 	int i, no_index;
+	int ret = 1;
 	const char *paths[2];
 	struct strbuf replacement = STRBUF_INIT;
 	const char *prefix = revs->prefix;
@@ -295,16 +296,18 @@ int diff_no_index(struct rev_info *revs,
 	revs->diffopt.flags.exit_with_status = 1;
 
 	if (queue_diff(&revs->diffopt, paths[0], paths[1]))
-		return 1;
+		goto out;
 	diff_set_mnemonic_prefix(&revs->diffopt, "1/", "2/");
 	diffcore_std(&revs->diffopt);
 	diff_flush(&revs->diffopt);
 
-	strbuf_release(&replacement);
-
 	/*
 	 * The return code for --no-index imitates diff(1):
 	 * 0 = no changes, 1 = changes, else error
 	 */
-	return diff_result_code(&revs->diffopt, 0);
+	ret = diff_result_code(&revs->diffopt, 0);
+
+out:
+	strbuf_release(&replacement);
+	return ret;
 }