Refuse "ip link add/replace" without device type parameter

Fix confusing error message noticed by Martin Josefsson:
Fix typo noticed by Phil Oester: information vs. informatin

# ip link add
RTNETLINK answers: Operation not supported

The reason is missing device type information, refuse this and print a message.

Signed-off-by: Patrick McHardy <kaber@trash.net>
1 file changed