Blargh, more fdFree() braindamage

- Commit 429b933b42 fixes the fd-leak
  regression in rpm 4.10, but we already have code which relies
  on the new behavior and segfaults with the former one. Adjust
  rpmcpioClose() to the old behavior to get master tree back to
  working shape. TODO: fix this properly some rainy day (oh and see
  http://geekandpoke.typepad.com/geekandpoke/2012/08/likelihood.html)

lib/cpio.c

@@ -335,7 +335,8 @@ int rpmcpioClose(rpmcpio_t cpio)
     if ((cpio->mode & O_ACCMODE) == O_WRONLY) {
         rc = rpmcpioTrailerWrite(cpio);
     }
-    cpio->fd = fdFree(cpio->fd);
+    fdFree(cpio->fd);
+    cpio->fd = NULL;
     return rc;
 }