tpm2_evictcontrol: don't copy optarg variable for context file path
tpm2_evictcontrol: don't copy optarg variable for context file path

The getopt_long() function already sets optarg to point to the argument of
the option, so there's no need to copy the value in a character array.

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

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