Fix the crashing disposal of a non-set up driver
Fix the crashing disposal of a non-set up driver

Fixes https://github.com/mono/CppSharp/issues/1404.

Signed-off-by: Dimitar Dobrev <ca751a5c976abad79158718440750fc638d19ebc@protonmail.com>

mono/CppSharp,mono/CppSharp,mono/CppSharp,mono/CppSharp,mono/CppSharp,mono/CppSharp