bsdkm: return 0 from wolfkdriv_process() to comply with opencrypto(9)

cryptodev_process must return 0 once crypto_done() has fired; errors are reported via crp_etype, otherwise the framework may re-dispatch an already-completed request.

Signed-off-by: Sameeh Jubran <sameeh@wolfssl.com>

bsdkm/wolfkmod.c

@@ -1020,7 +1020,8 @@ static int wolfkdriv_process(device_t dev, struct cryptop * crp, int hint)
                   csp->csp_mode, csp->csp_cipher_alg, error);
     #endif /* WOLFSSL_BSDKM_VERBOSE_DEBUG */
 
-    return (error);
+    /* opencrypto(9) contract: return 0 after crypto_done(); error is in crp_etype. */
+    return (0);
 }
 
 /*