Check correct error

The error check accidentally checks for a previous
error instead of the current

Signed-off-by: Brett Logan <brett.t.logan@ibm.com>
(cherry picked from commit 7da02d1)

bccsp/pkcs11/pkcs11.go

@@ -544,7 +544,7 @@ func (csp *impl) generateECKey(curve asn1.ObjectIdentifier, ephemeral bool) (ski
 			return nil, nil, fmt.Errorf("P11: Private Key copy failed with error [%s]. Please contact your HSM vendor", prvCopyerror)
 		}
 		prvKeyDestroyError := csp.ctx.DestroyObject(session, prv)
-		if pubKeyDestroyError != nil {
+		if prvKeyDestroyError != nil {
 			return nil, nil, fmt.Errorf("P11: Private Key destroy failed with error [%s]. Please contact your HSM vendor", prvKeyDestroyError)
 		}
 	}