Fix for case where wc_ClearErrorNodes is called, but then wc_PullErrorNode is called and wc_current_node is populated with invalid ->next pointer.

wolfcrypt/src/logging.c

@@ -679,6 +679,7 @@ void wc_ClearErrorNodes(void)
 
     wc_errors       = NULL;
     wc_last_node    = NULL;
+    wc_current_node = NULL;
     wc_UnLockMutex(&debug_mutex);
 #endif /* DEBUG_WOLFSSL || WOLFSSL_NGINX */
 }