Glenn McGrath (bug1) isaway from my email till the 17th, but caught me on IRC.

He took a look into the recent reports of tar problems, and found an obvious
typo in last_patch91 from vodz which converted tar to use bb_getopt_ulflags.

archival/tar.c

@@ -687,7 +687,7 @@ int tar_main(int argc, char **argv)
 	}
 #endif
 #ifdef CONFIG_FEATURE_TAR_BZIP2
-	if(opt & TAR_OPT_GZIP) {
+	if(opt & TAR_OPT_BZIP2) {
 			get_header_ptr = get_header_tar_bz2;
 	}
 #endif