libtiff: test_signed_tags.c: fix CID 1504376

SDL Commits
1 
From 1f2bf6e95555abb84e530b4dd08dba87e7424abc Mon Sep 17 00:00:00 2001
From: Even Rouault <[EMAIL REDACTED]>
Date: Tue, 10 May 2022 15:59:00 +0200
Subject: [PATCH] test_signed_tags.c: fix CID 1504376

---
 test/test_signed_tags.c | 3 +--
 1 file changed, 1 insertion(+), 2 deletions(-)

diff --git a/test/test_signed_tags.c b/test/test_signed_tags.c
index 582ba3aa..b3218aa6 100644
--- a/test/test_signed_tags.c
+++ b/test/test_signed_tags.c
@@ -101,13 +101,12 @@ static int writeTestTiff(const char *szFileName, int isBigTiff)
 	TIFF *tif;
 	int retcode = FAULT_RETURN;
 
+	unlink(szFileName);
 	if (isBigTiff) {
 		fprintf(stdout, "\n-- Writing signed values to BigTIFF...\n");
-		ret = unlink(szFileName);
 		tif = TIFFOpen(szFileName, "w8");
 	} else {
 		fprintf(stdout, "\n-- Writing signed values to ClassicTIFF...\n");
-		unlink(szFileName);
 		tif = TIFFOpen(szFileName, "w");
 	}
 	if (!tif) {