fixup! fix(core): validate start + size for buffer ops in more places

Author: ErichDonGubler

wgpu-core/src/command/transfer.rs

@@ -1058,7 +1058,7 @@ pub(super) fn copy_buffer_to_buffer(
 
     // TODO: Checks for source buffer overrun don't quite match spec., but it seems important to do
     // things in this order.
-    if destination_offset >= dst_buffer.size {
+    if destination_offset > dst_buffer.size {
         return Err(TransferError::BufferStartOffsetOverrun {
             start_offset: destination_offset,
             buffer_size: dst_buffer.size,