Add a BSM conversion switch case for AUE_GETCWD, so that a console

warning isn't generated when __getcwd() is invoked.

MFC after:	3 days
Obtained from:	TrustedBSD Project

sys/security/audit/audit_bsm.c

@@ -1312,6 +1312,9 @@ kaudit_to_bsm(struct kaudit_record *kar, struct au_record **pau)
 		}
 		break;
 
+	case AUE_GETCWD:
+		break;
+
 	default:
 		printf("BSM conversion requested for unknown event %d\n",
 		    ar->ar_event);