<fix>

修复报警信息，为以下修复点
1、修复空指针未判断
2、修复open后未及时close 导致内存泄露
3、修复strdup后未free
4、修复赋值后未使用等问题
5、修复编码中判断条件中无符号变量小于零的情况

Signed-off-by: xiacong <xiacong4@huawei.com>
Change-Id: I13d046141afeb8a116e6a04304a3793bf8e12bee
Signed-off-by: xiacong <xiacong4@huawei.com>

kal/cmsis/cmsis_liteos2.c

@@ -978,21 +978,17 @@ osStatus_t osEventFlagsDelete(osEventFlagsId_t ef_id)
 {
     PEVENT_CB_S pstEventCB = (PEVENT_CB_S)ef_id;
     UINT32 intSave;
-    osStatus_t ret;
+    osStatus_t ret = osOK;
     if (OS_INT_ACTIVE) {
         return osErrorISR;
     }
     intSave = LOS_IntLock();
-    if (LOS_EventDestroy(pstEventCB) == LOS_OK) {
-        ret = osOK;
-    } else {
+    if (LOS_EventDestroy(pstEventCB) != LOS_OK) {
         ret = osErrorParameter;
     }
     LOS_IntRestore(intSave);
 
-    if (LOS_MemFree(m_aucSysMem0, (void *)pstEventCB) == LOS_OK) {
-        ret = osOK;
-    } else {
+    if (LOS_MemFree(m_aucSysMem0, (void *)pstEventCB) != LOS_OK) {
         ret = osErrorParameter;
     }
 

kal/posix/src/time.c

@@ -501,7 +501,7 @@ time_t time(time_t *timer)
 {
     UINT64 usec = 0;
     time_t sec;
-    INT32 rtcRet = 0;
+    INT32 rtcRet;
 
     if (g_rtcTimeFunc.RtcGetTimeHook != NULL) {
         rtcRet = g_rtcTimeFunc.RtcGetTimeHook(&usec);