Move bio in gate so no need for null check

Author: aidangarske

src/wp_dh_kmgmt.c

@@ -2529,10 +2529,9 @@ static int wp_dh_encode(wp_DhEncDecCtx* ctx, OSSL_CORE_BIO *cBio,
     OSSL_PASSPHRASE_CALLBACK *pwCb, void *pwCbArg)
 {
     int ok = 1;
-    BIO* out = NULL;
 #if (LIBWOLFSSL_VERSION_HEX >= 0x05000000 && defined(WOLFSSL_DH_EXTRA))
     int rc;
-    out = wp_corebio_get_bio(ctx->provCtx, cBio);
+    BIO* out = wp_corebio_get_bio(ctx->provCtx, cBio);
     unsigned char* keyData = NULL;
     size_t keyLen;
     unsigned char* derData = NULL;
@@ -2656,6 +2655,8 @@ static int wp_dh_encode(wp_DhEncDecCtx* ctx, OSSL_CORE_BIO *cBio,
         OPENSSL_free(pemData);
     }
     OPENSSL_free(cipherInfo);
+
+    BIO_free(out);
 #else
     (void)ctx;
     (void)cBio;
@@ -2666,9 +2667,6 @@ static int wp_dh_encode(wp_DhEncDecCtx* ctx, OSSL_CORE_BIO *cBio,
     (void)pwCbArg;
 #endif
 
-    if (out != NULL) {
-        BIO_free(out);
-    }
     WOLFPROV_LEAVE(WP_LOG_KE, __FILE__ ":" WOLFPROV_STRINGIZE(__LINE__), ok);
     return ok;
 }