asn1/tasn_utl.c: fix logical error in and overhaul asn1_do_lock.
CRYPTO_atomic_add was assumed to return negative value on error, while
it returns 0.
Reviewed-by: 
Rich Salz <rsalz@openssl.org>
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CRYPTO_atomic_add was assumed to return negative value on error, while
it returns 0.
Reviewed-by: Rich Salz <rsalz@openssl.org>