selftests: net: remove redundant ncdevmem print

Remove extrenous fprintf

Signed-off-by: Jamal Hadi Salim <jhs@mojatatu.com>
Reviewed-by: Mina Almasry <almasrymina@google.com>
Link: https://patch.msgid.link/20241218140018.15607-1-jhs@mojatatu.com


Signed-off-by: Jakub Kicinski <kuba@kernel.org>