[SYCL][L0] Fix memory leak in piDevicesGet() (#1917)

Exit early if 'Devices' parameter is nullptr.

Signed-off-by: Byoungro So <[email protected]>

Author: bso-intel

sycl/plugins/level_zero/pi_level0.cpp

@@ -612,10 +612,15 @@ pi_result piDevicesGet(pi_platform Platform, pi_device_type DeviceType,
   if (NumDevices)
     *NumDevices = ZeDeviceCount;
 
+  if (NumEntries == 0) {
+    assert(Devices == nullptr &&
+           "Devices should be nullptr when querying the number of devices");
+    return PI_SUCCESS;
+  }
+
   try {
-    // TODO: Delete array at teardown
-    ze_device_handle_t *ZeDevices = new ze_device_handle_t[ZeDeviceCount];
-    ZE_CALL(zeDeviceGet(ZeDriver, &ZeDeviceCount, ZeDevices));
+    std::vector<ze_device_handle_t> ZeDevices(ZeDeviceCount);
+    ZE_CALL(zeDeviceGet(ZeDriver, &ZeDeviceCount, ZeDevices.data()));
 
     for (uint32_t I = 0; I < ZeDeviceCount; ++I) {
       if (I < NumEntries) {