Hello,

I'm trying to convert dwg to dxf using dwg2dxf, there are some errors and the dxf file is not generated.

Are there any way to solve the errors? 

Thank you.

### environment
macOS big sur 11.5.2 , Apple clang version 12.0.5 (clang-1205.0.22.9),GNU Make 3.81, libredwg latest [commit](https://github.com/LibreDWG/libredwg/commit/a0636e94f35cfc140cccfb026dabb1de2742977f)

compile with

./autogen.sh && ./configure --disable-bindings && make && sudo make install

### some information
programs/dwg2dxf -o ~/Downloads/6151acdedf1bc01e5a5847868d8bdbbee139b29c.dwg.dxf  ~/Downloads/6151acdedf1bc01e5a5847868d8bdbbee139b29c.dwg -y
Reading DWG file /Downloads/6151acdedf1bc01e5a5847868d8bdbbee139b29c.dwg
Warning: 
@0x6834 => start 0x7b5d
Warning: 
@0x7e61 => start 0x8508
ERROR: DWG_SENTINEL_R11_VIEW_BEGIN not found at 34056
ERROR: Failed to decode file: /Downloads/6151acdedf1bc01e5a5847868d8bdbbee139b29c.dwg 0x100

origin dwg file open with AutoCAD:
![image](https://github.com/LibreDWG/libredwg/assets/42831401/737b0df6-a61f-4450-9aca-6c9dca7089c2)


### attachment
[6151acdedf1bc01e5a5847868d8bdbbee139b29c.dwg.zip](https://github.com/LibreDWG/libredwg/files/11859001/6151acdedf1bc01e5a5847868d8bdbbee139b29c.dwg.zip)

decode error in r11 layer and view.address
This is a GitHub Issue
repo:libredwg
owner:LibreDWG
Title : decode error in r11 layer and view.address
Issue date:

--- start body ---
Hello,

I'm trying to convert dwg to dxf using dwg2dxf, there are some errors and the dxf file is not generated.

Are there any way to solve the errors? 

Thank you.

### environment
macOS big sur 11.5.2 , Apple clang version 12.0.5 (clang-1205.0.22.9),GNU Make 3.81, libredwg latest [commit](https://github.com/LibreDWG/libredwg/commit/a0636e94f35cfc140cccfb026dabb1de2742977f)

compile with

./autogen.sh && ./configure --disable-bindings && make && sudo make install

### some information
programs/dwg2dxf -o ~/Downloads/6151acdedf1bc01e5a5847868d8bdbbee139b29c.dwg.dxf  ~/Downloads/6151acdedf1bc01e5a5847868d8bdbbee139b29c.dwg -y
Reading DWG file /Downloads/6151acdedf1bc01e5a5847868d8bdbbee139b29c.dwg
Warning: 
@0x6834 => start 0x7b5d
Warning: 
@0x7e61 => start 0x8508
ERROR: DWG_SENTINEL_R11_VIEW_BEGIN not found at 34056
ERROR: Failed to decode file: /Downloads/6151acdedf1bc01e5a5847868d8bdbbee139b29c.dwg 0x100

origin dwg file open with AutoCAD:
![image](https://github.com/LibreDWG/libredwg/assets/42831401/737b0df6-a61f-4450-9aca-6c9dca7089c2)


### attachment
[6151acdedf1bc01e5a5847868d8bdbbee139b29c.dwg.zip](https://github.com/LibreDWG/libredwg/files/11859001/6151acdedf1bc01e5a5847868d8bdbbee139b29c.dwg.zip)

--- end body ---
