Fixing the following compiler warnings:
FuseService.cpp: In function ‘int VeraCrypt::fuse_service_read(const char*, char*, size_t, off_t, fuse_file_info*)’:
FuseService.cpp:233:12: warning: catching polymorphic type ‘struct VeraCrypt::MissingVolumeData’ by value [-Wcatch-value=]
233 | catch (MissingVolumeData)
| ^~~~~~~~~~~~~~~~~
FuseService.cpp: In static member function ‘static int VeraCrypt::FuseService::ExceptionToErrorCode()’:
FuseService.cpp:362:15: warning: catching polymorphic type ‘class std::bad_alloc’ by value [-Wcatch-value=]
362 | catch (std::bad_alloc)
| ^~~~~~~~~
Apart from warnings, the current code creates unnecessary copies of the exception object in debug mode. (But not in -O3)
