Fix rtc read issue

Signed-off-by: Sadik.Ozer <Sadik.Ozer@maximintegrated.com>

Author: Sadik.Ozer

targets/TARGET_Maxim/TARGET_MAX32670/Libraries/PeriphDrivers/Source/RTC/rtc_reva.c

@@ -319,27 +319,27 @@ int MXC_RTC_RevA_GetTime(uint32_t* sec, uint32_t* subsec)
     do {
         // Check if an update is about to happen.
         if (!(MXC_RTC->ctrl & MXC_F_RTC_REVA_CTRL_RDY)) {
-            continue;
+            return E_BUSY;
         }
 
         // Read the seconds count.
         temp_sec = MXC_RTC_RevA_GetSecond();
 
         if (temp_sec == E_BUSY) {
-            continue;
+            return E_BUSY;
         }
 
         // Check if an update is about to happen.
         if (!(MXC_RTC->ctrl & MXC_F_RTC_REVA_CTRL_RDY)) {
-            continue;
+            return E_BUSY;
         }
 
         // Read the sub-seconds count.
         *subsec = MXC_RTC_RevA_GetSubSecond();
 
         // Check if an update is about to happen.
         if (!(MXC_RTC->ctrl & MXC_F_RTC_REVA_CTRL_RDY)) {
-            continue;
+            return E_BUSY;
         }
 
         // Read the seconds count.