Wrong error message in case of validation error

[vouillon]

Running this test program, I get the following error:

$ ./bin/wizeng.x86-linux  -ext:gc -ext:exception-handling ./print_array.wasm 
./print_array.wasm:0x3D04:Code[49]: expected 148 data segments, missing data section

We should get the following validation error instead:

 ./bin/wizeng.x86-linux  -ext:gc -ext:exception-handling ./print_array.wasm 
./print_array.wasm:0x7F82:Code[49]: expected type (ref array #0), got i32

The issue is that in case of validation error, the parsing is interrupted but the check for missing data section is still performed, overriding the previous error.