Added missing mutex lock in VmaDefragmentationContext_T::DefragmentPassEnd As proposed by @JustSid in https://github.com/GPUOpen-LibrariesAndSDKs/VulkanMemoryAllocator/issues/313

diff --git a/include/vk_mem_alloc.h b/include/vk_mem_alloc.h
index ae2c984..3934de3 100644
--- a/include/vk_mem_alloc.h
+++ b/include/vk_mem_alloc.h

@@ -12377,7 +12377,11 @@
         {
         case VMA_DEFRAGMENTATION_MOVE_OPERATION_COPY:
         {
-            uint8_t mapCount = move.srcAllocation->SwapBlockAllocation(vector->m_hAllocator, move.dstTmpAllocation);
+            uint8_t mapCount = 0;
+            {
+                VmaMutexLockWrite swapLock(vector->GetMutex(), vector->GetAllocator()->m_UseMutex);
+                mapCount = move.srcAllocation->SwapBlockAllocation(vector->m_hAllocator, move.dstTmpAllocation);
+            }
             if (mapCount > 0)
             {
                 allocator = vector->m_hAllocator;