Issue a warning if there's a non-zero exit value.

usr.bin/tar/Makefile

@@ -1,7 +1,7 @@
 # $FreeBSD$
 
 PROG=	bsdtar
-VERSION=	2.0.23
+VERSION=	2.0.25
 SRCS=	bsdtar.c getdate.y matching.c read.c tree.c util.c write.c
 WARNS?=	5
 DPADD=	${LIBARCHIVE} ${LIBBZ2} ${LIBZ}

usr.bin/tar/bsdtar.c

@@ -657,6 +657,9 @@ main(int argc, char **argv)
 	}
 
 	cleanup_exclusions(bsdtar);
+	if (bsdtar->return_value != 0)
+		bsdtar_warnc(bsdtar, 0,
+		    "Error exit delayed from previous errors.");
 	return (bsdtar->return_value);
 }