修复esp32编译报错问题

Signed-off-by: ou-yangkan <519689417@qq.com>

arch/xtensa/lx6/gcc/los_context.c

@@ -110,6 +110,7 @@ LITE_OS_SEC_TEXT_MINOR VOID ArchSysExit(VOID)
 
 LITE_OS_SEC_TEXT_INIT VOID *ArchTskStackInit(UINT32 taskID, UINT32 stackSize, VOID *topStack)
 {
+    errno_t result;
     TaskContext *context = (TaskContext *)((UINTPTR)topStack + stackSize - sizeof(TaskContext));
 
     /* initialize the task context */