Improvement in function vmaDefragmentationBegin. Added validation of input arrays.
Improvement in function vmaDefragmentationBegin. Added validation of input arrays.

GPUOpen-LibrariesAndSDKs/VulkanMemoryAllocator,GPUOpen-LibrariesAndSDKs/VulkanMemoryAllocator,GPUOpen-LibrariesAndSDKs/VulkanMemoryAllocator