chardev/baum: Fix compiler warning for Windows builds

Compiler warning:

../chardev/baum.c:657:25: warning: comparison between pointer and integer

Use brlapi_fileDescriptor instead of int for brlapi_fd and
BRLAPI_INVALID_FILE_DESCRIPTOR instead of -1.

Signed-off-by: Stefan Weil <sw@weilnetz.de>
Reviewed-by: Samuel Thibault <samuel.thibault@ens-lyon.org>
Reviewed-by: Michael Tokarev <mjt@tls.msk.ru>
Signed-off-by: Michael Tokarev <mjt@tls.msk.ru>
1 file changed