pipe: fix pipe test case failed
pipe shouldn't use /tmp folder, /tmp maybe mounted to tmpfs
* Pre-processor Definitions
****************************************************************************/
-#define FIFO_PATH1 "/tmp/testfifo-1"
-#define FIFO_PATH2 "/tmp/testfifo-2"
+#define FIFO_PATH1 "/var/testfifo-1"
+#define FIFO_PATH2 "/var/testfifo-2"
/****************************************************************************
* Public Types
