fixed 5caa08be from https://gitee.com/zhushengle/drivers_liteos/pulls/48

fix: 修复内存分配后未校验返回值的问题

Close #I632OQ
Signed-off-by: Nzhushengle <zhushengle@huawei.com>
Change-Id: If7e1f0ff6a17dc2d33fd486b16664306458bf343

hievent/src/hievent_driver.c

@@ -359,23 +359,31 @@ static struct file_operations_vfs g_hieventFops = {
     .poll  = HieventPoll,   /* poll */
 };
 
-static void HieventDeviceInit(void)
+static int HieventDeviceInit(void)
 {
     g_hieventDev.buffer = LOS_MemAlloc((VOID *)OS_SYS_MEM_ADDR,
                                        HIEVENT_LOG_BUFFER);
+    if (g_hieventDev.buffer == NULL) {
+        return -ENOMEM;
+    }
 
     init_waitqueue_head(&g_hieventDev.wq);
-    LOS_MuxInit(&g_hieventDev.mtx, NULL);
+    (void)LOS_MuxInit(&g_hieventDev.mtx, NULL);
 
     g_hieventDev.writeOffset = 0;
     g_hieventDev.headOffset = 0;
     g_hieventDev.size = 0;
     g_hieventDev.count = 0;
+    return 0;
 }
 
 int HieventInit(void)
 {
-    HieventDeviceInit();
+    int ret = HieventDeviceInit();
+    if (ret != 0) {
+        return ret;
+    }
+
     register_driver("/dev/hwlog_exception", &g_hieventFops,
                     DRIVER_MODE, &g_hieventDev);
     return 0;