Fixed bug in VmaAllocator_T::Defragment.

src/vk_mem_alloc.h

diff --git a/src/vk_mem_alloc.h b/src/vk_mem_alloc.h
index 2c4f5ed..be6deb2 100644
--- a/src/vk_mem_alloc.h
+++ b/src/vk_mem_alloc.h
@@ -12516,7 +12516,7 @@
 {

     if(pAllocationsChanged != VMA_NULL)

     {

-        memset(pAllocationsChanged, 0, sizeof(*pAllocationsChanged));

+        memset(pAllocationsChanged, 0, allocationCount * sizeof(VkBool32));

     }

     if(pDefragmentationStats != VMA_NULL)

     {