fix: take into account MR comments

components/esp_system/include/esp_private/fp_unwind.h

@@ -0,0 +1,27 @@
+/*
+ * SPDX-FileCopyrightText: 2025 Espressif Systems (Shanghai) CO LTD
+ *
+ * SPDX-License-Identifier: Apache-2.0
+ */
+
+#ifndef FP_UNWIND_H
+#define FP_UNWIND_H
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+/**
+ * @brief Print backtrace for the given execution frame thanks to the frame pointers.
+ *
+ * @param frame_or Snapshot of the CPU registers when the program stopped its
+ *                 normal execution. This frame is usually generated on the
+ *                 stack when an exception or an interrupt occurs.
+ */
+void esp_fp_print_backtrace(const void *frame_or);
+
+#ifdef __cplusplus
+}
+#endif
+
+#endif // FP_UNWIND_H