safeclib: fix trailing whitespace

Fixes trailing whitespace after MIT

Fixes:
 - https://gitlab.com/buildroot.org/buildroot/-/jobs/50971692



Signed-off-by: Fabrice Fontaine <fontaine.fabrice@gmail.com>
Acked-by: "Yann E. MORIN" <yann.morin.1998@free.fr>
Signed-off-by: Peter Korsgaard <peter@korsgaard.com>