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 <[email protected]>
Signed-off-by: René Scharfe <[email protected]>
Signed-off-by: Junio C Hamano <[email protected]>

Author: rscharfe

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;
 }