debug/getwd_chk.c: warning should be emitted for the __getwd_chk symbol.

Otherwise the warning message for the getwd symbol ends up being duplicated.

Signed-off-by: Frederic Cambus <fred@statdns.com>
Reviewed-by: Adhemerval Zanella <adhemerval.zanella@linaro.org>
Signed-off-by: Andreas K. Hüttel <dilfridge@gentoo.org>