Fix use after free bug

nfc_exit(context); was called 2 times

CID 1090348 (#1 of 1): Use after free (USE_AFTER_FREE)53. deref_arg:
Calling "nfc_exit(nfc_context *)" dereferences freed pointer "context".
(The dereference is assumed on the basis of the 'nonnull' parameter
attribute.)

utils/nfc-relay-picc.c

@@ -486,7 +486,6 @@ main(int argc, char *argv[])
           }
           if (!initiator_only_mode) {
             nfc_close(pndTarget);
-            nfc_exit(context);
           }
           nfc_exit(context);
           exit(EXIT_FAILURE);