Update p11_ec.c
Update p11_ec.c

Fix null pointer dereference: since this code does not provide a custom verify method, we need to use the OpenSSL-provided default.
OpenSC/libp11,mtrojnar/libp11,nmav/libp11,mouse07410/libp11,nmav/libp11,dengert/libp11,mouse07410/libp11,dengert/libp11,mtrojnar/libp11,OpenSC/libp11,gerow/libp11,gerow/libp11