Do not overwrite ret code in level_zero_shared_memory example

Author: vinser52

examples/level_zero_shared_memory/level_zero_shared_memory.c

@@ -189,6 +189,6 @@ int main(void) {
     umfLevelZeroMemoryProviderParamsDestroy(ze_memory_provider_params);
 
 level_zero_destroy:
-    ret = destroy_context(hContext);
+    destroy_context(hContext);
     return ret;
 }