fix memory leaks

Change-Id: I18ad15dc802842324b3712f3f7833953434b1cf1

admin/change.c

@@ -183,8 +183,10 @@ kt_change(struct change_options *opt, int argc, char **argv)
     }
 
     /* XXX Parameterize keytab name */
-    if((keytab = ktutil_open_keytab()) == NULL)
+    if ((keytab = ktutil_open_keytab()) == NULL) {
+	free(kstuple);
 	return 1;
+    }
 
     j = 0;
     max = 0;

kadmin/ank.c

@@ -305,5 +305,6 @@ add_new_key(struct add_options *opt, int argc, char **argv)
 	int16_t dummy = 3;
 	kadm5_free_key_data (kadm_handle, &dummy, key_data);
     }
+    free(kstuple);
     return ret != 0;
 }