In bunzip replace setjmp/longjmp handling with error_exit(), replace string
based handling of a 6-byte header with with two 24-bit integer reads.  Use
xmalloc() and xzalloc().
diff --git a/lib/lib.h b/lib/lib.h
index 3a7d650..5ac8e10 100644
--- a/lib/lib.h
+++ b/lib/lib.h
@@ -68,4 +68,4 @@
 
 struct mtab_list *getmountlist(int die);
 
-char *bunzipStream(int src_fd, int dst_fd);
+void bunzipStream(int src_fd, int dst_fd);