x509: add the check for X509_STORE_lock

x509: add the check for X509_STORE_lock

Since we may fail to get the lock, for example there is no lock, the
X509_STORE_lock() will return 0.
Therefore, we should check it in order to prevent the dirty data.

Signed-off-by: Jiasheng Jiang <jiasheng@iscas.ac.cn>
Reviewed-by: Paul Dale <pauli@openssl.org>
Reviewed-by: Matt Caswell <matt@openssl.org>
Reviewed-by: Tomas Mraz <tomas@openssl.org>
(Merged from https://github.com/openssl/openssl/pull/17575)