wolfssl: Fix memory leak on failed ICV verification if not using in-place decryption

Fixes: c92eade82c ("wolfssl: Add wolfSSL plugin for cryptographic implementations")

src/libstrongswan/plugins/wolfssl/wolfssl_aead.c

@@ -236,7 +236,10 @@ METHOD(aead_t, decrypt, bool,
 		default:
 			break;
 	}
-
+	if (!success && plain)
+	{
+		chunk_free(plain);
+	}
 	memwipe(nonce.ptr, nonce.len);
 	return success;
 }