From c335a0090ce542f4e91b1f5d1d01d5f3f27d4c4a Mon Sep 17 00:00:00 2001
From: Vincent Coubard <vincent.coubard@arm.com>
Date: Tue, 6 Jun 2017 23:03:28 +0100
Subject: [PATCH] rtc_time: Fix incorrect return value when the calendar is not
 available.

According to the C99 specification "The value (time_t)(-1) is returned if the
calendar time is not available". Before this patch, in such case the function
was returning 0 instead of -1.
---
 platform/mbed_rtc_time.cpp | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/platform/mbed_rtc_time.cpp b/platform/mbed_rtc_time.cpp
index 5f4b24a0eb..6f26fb27a8 100644
--- a/platform/mbed_rtc_time.cpp
+++ b/platform/mbed_rtc_time.cpp
@@ -53,7 +53,7 @@ time_t time(time_t *timer)
         }
     }
     
-    time_t t = 0;
+    time_t t = -1;
     if (_rtc_read != NULL) {
         t = _rtc_read();
     }