command_queue: fix Klocwork issues

Author: sophimao

test/acl_command_queue_test.cpp

@@ -173,6 +173,7 @@ MT_TEST(acl_command_queue, create) {
   // check if acl_command_queue_is_valid is working properly
   {
     cl_command_queue fake_cq = acl_alloc_cl_command_queue();
+    CHECK(fake_cq != 0);
     fake_cq->magic = 0xDEADBEEFDEADBEEF;
     ACL_LOCKED(CHECK(!acl_command_queue_is_valid(0)));
     ACL_LOCKED(CHECK(!acl_command_queue_is_valid(fake_cq)));
@@ -365,6 +366,7 @@ MT_TEST(acl_command_queue, create_with_properties) {
   // check if acl_command_queue_is_valid is working properly
   {
     cl_command_queue fake_cq = acl_alloc_cl_command_queue();
+    CHECK(fake_cq != 0);
     fake_cq->magic = 0xDEADBEEFDEADBEEF;
     ACL_LOCKED(CHECK(!acl_command_queue_is_valid(0)));
     ACL_LOCKED(CHECK(!acl_command_queue_is_valid(fake_cq)));