Fix potential buffer overruns in CONSRV

/reactos-cov/win32ss/user/winsrv/consrv/conoutput.c -- Line 528

CID 1236970 (#1 of 1): Out-of-bounds access (ARRAY_VS_SINGLETON)

6. callee_ptr_arith: Passing CharInfo to function ConDrvReadConsoleOutput which uses it as an array. This might corrupt or misinterpret adjacent memory locations. [show details]

528    Status = ConDrvReadConsoleOutput(Buffer->Header.Console,

529                                     Buffer,

530                                     ReadOutputRequest->Unicode,

531                                     CharInfo,

532                                     &ReadOutputRequest->ReadRegion);

533

/reactos-cov/win32ss/user/winsrv/consrv/conoutput.c -- Line 627

CID 1236969 (#1 of 1): Out-of-bounds access (ARRAY_VS_SINGLETON)

8. callee_ptr_arith: Passing CharInfo to function ConDrvWriteConsoleOutput which uses it as an array. This might corrupt or misinterpret adjacent memory locations. [show details]

627    Status = ConDrvWriteConsoleOutput(Buffer->Header.Console,

628                                      Buffer,

629                                      WriteOutputRequest->Unicode,

630                                      CharInfo,

631                                      &WriteOutputRequest->WriteRegion);