layers: GL92, Properly remove cmd buf metadata

When FreeCommandBuffers was called the helper routine was not
properly removing the command buffer tracking data.
diff --git a/layers/mem_tracker.cpp b/layers/mem_tracker.cpp
index ddd55fb..f2f1871 100644
--- a/layers/mem_tracker.cpp
+++ b/layers/mem_tracker.cpp
@@ -180,7 +180,7 @@
     VkBool32 result = VK_TRUE;
     result = clear_cmd_buf_and_mem_references(my_data, cb);
     // Delete the CBInfo info
-    if (result == VK_TRUE) {
+    if (result != VK_TRUE) {
         my_data->commandPoolMap[commandPool].pCommandBuffers.remove(cb);
         my_data->cbMap.erase(cb);
     }