lib/tpm2_session.c: free path on exit
lib/tpm2_session.c: free path on exit

When the fopen() call fails, the strdup() of path is not freed, so
free it.

Signed-off-by: William Roberts <60148e894dabf0b83bde1d460768794cd453c455@intel.com>

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