options: remove unused ':' case option and error messages
options: remove unused ':' case option and error messages

By default the getopt_long() function prints an error message and returns
a '?' character to indicate an error. And it only returns a ':' on error
if the optstring starts with a colon.

So the ':' switch case wasn't used and also the printed error is unneeded
since getopt_long() already prints this.

Signed-off-by: Javier Martinez Canillas <8fdf2abf85d34ea8f3f979ef25dc1f25d94aca29@redhat.com>

martinezjavier/tpm2-tools,01org/tpm2.0-tools,01org/tpm2.0-tools,martinezjavier/tpm2-tools,martinezjavier/tpm2-tools,martinezjavier/tpm2-tools,01org/tpm2.0-tools