support gzip -t and bzip2 -t

diff --git a/archival/bzip2.c b/archival/bzip2.c
index eb570c4..62df4aa 100644
--- a/archival/bzip2.c
+++ b/archival/bzip2.c
@@ -162,11 +162,11 @@
 
 	opt_complementary = "s2"; /* -s means -2 (compatibility) */
 	/* Must match bbunzip's constants OPT_STDOUT, OPT_FORCE! */
-	opt = getopt32(argv, "cfv" USE_BUNZIP2("d") "123456789qzs" );
+	opt = getopt32(argv, "cfv" USE_BUNZIP2("dt") "123456789qzs");
 #if ENABLE_BUNZIP2 /* bunzip2_main may not be visible... */
-	if (opt & 0x8) // -d
+	if (opt & 0x18) // -d and/or -t
 		return bunzip2_main(argc, argv);
-	opt >>= 4;
+	opt >>= 5;
 #else
 	opt >>= 3;
 #endif