crypto: drbg - always try to free Jitter RNG instance

commit 819966c0 upstream.

The Jitter RNG is unconditionally allocated as a seed source follwoing
the patch 97f2650e

. Thus, the instance must always be deallocated.

Reported-by:  <syzbot+2e635807decef724a1fa@syzkaller.appspotmail.com>
Fixes: 97f2650e

 ("crypto: drbg - always seeded with SP800-90B ...")
Signed-off-by: Stephan Mueller <smueller@chronox.de>
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
Signed-off-by: Jason A. Donenfeld <Jason@zx2c4.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>