src/topology.c: Fix NULL check

Now that HsaNodeProperties is passed in to
topology_get_node_props_from_drm, check that pointer instead of the
pointer for MarketingName (which throws a compiler warning)

Signed-off-by: kent.russell@amd.com <kent.russell@amd.com>
Change-Id: If76b24e1bab5a62e514ab440b6316c7b7cd264c1

src/topology.c

@@ -1014,7 +1014,7 @@ static int topology_get_node_props_from_drm(HsaNodeProperties *props)
 	const char *name;
 	int i, ret = 0;
 
-	if (props->MarketingName == NULL)
+	if (props == NULL)
 		return -1;
 
 	drm_fd = drmOpenRender(props->DrmRenderMinor);