A fix in VmaBlockMetadata_TLSF::CreateAllocationRequest

Code by @medranSolus. See #343

include/vk_mem_alloc.h

diff --git a/include/vk_mem_alloc.h b/include/vk_mem_alloc.h
index 823cef8..a094898 100644
--- a/include/vk_mem_alloc.h
+++ b/include/vk_mem_alloc.h
@@ -10295,8 +10295,8 @@
     else
         sizeForNextList += smallSizeStep;
 
-    uint32_t nextListIndex = 0;
-    uint32_t prevListIndex = 0;
+    uint32_t nextListIndex = m_ListsCount;
+    uint32_t prevListIndex = m_ListsCount;
     Block* nextListBlock = VMA_NULL;
     Block* prevListBlock = VMA_NULL;