finally fixed "-Wformat-security" warning

Author: evanbiederstedt

src/rigraph/rinterface.c

@@ -197,14 +197,9 @@ SEXP R_igraph_handle_safe_eval_result(SEXP result) {
       SEXP condition_message = PROTECT(Rf_install("conditionMessage"));
       SEXP condition_message_call = PROTECT(Rf_lang2(condition_message, result));
       SEXP evaluated_condition_message = PROTECT(Rf_eval(condition_message_call, R_GlobalEnv));
+      // error(CHAR(STRING_ELT(evaluated_condition_message, 0)));
       // fix for 'format string is not a string literal' flag warning
-      const char *message_char;
-      message_char = CHAR(STRING_ELT(evaluated_condition_message, 0));
-      if (message_char != NULL) {
-        error(message_char);
-      } else {
-        error("Something screwed up in R_igraph_handle_safe_eval_result()");
-      }
+      REprintf("%s\n", CHAR(STRING_ELT(evaluated_condition_message, 0)));
       UNPROTECT(3);
       return R_NilValue;