tools: imx8image: Improve error message

Improve error message "header tag mismatched"
Add filename to error message to see, which file
is wrong.

Signed-off-by: Heiko Schocher <hs@denx.de>
Reviewed-by: Alexander Sverdlin <alexander.sverdlin@siemens.com>
diff --git a/tools/imx8image.c b/tools/imx8image.c
index 7a06081..15510d3 100644
--- a/tools/imx8image.c
+++ b/tools/imx8image.c
@@ -734,7 +734,7 @@
 			fclose(fd);
 
 			if (header.tag != IVT_HEADER_TAG_B0) {
-				fprintf(stderr, "header tag mismatched \n");
+				fprintf(stderr, "header tag mismatched file %s\n", img_sp->filename);
 				exit(EXIT_FAILURE);
 			} else {
 				file_off +=