clar: check for failing strdup() calls

We're not checking for failing calls to `strdup()`. Fix this.

clar.c

@@ -537,7 +537,12 @@ clar_parse_args(int argc, char **argv)
 		case 'r':
 			_clar.write_summary = 1;
 			free(_clar.summary_filename);
-			_clar.summary_filename = *(argument + 2) ? strdup(argument + 2) : NULL;
+			if (*(argument + 2)) {
+				if ((_clar.summary_filename = strdup(argument + 2)) == NULL)
+					clar_abort("Failed to allocate summary filename.\n");
+			} else {
+				_clar.summary_filename = NULL;
+			}
 			break;
 
 		default:
@@ -563,11 +568,13 @@ clar_test_init(int argc, char **argv)
 	if (!_clar.summary_filename &&
 	    (summary_env = getenv("CLAR_SUMMARY")) != NULL) {
 		_clar.write_summary = 1;
-		_clar.summary_filename = strdup(summary_env);
+		if ((_clar.summary_filename = strdup(summary_env)) == NULL)
+			clar_abort("Failed to allocate summary filename.\n");
 	}
 
 	if (_clar.write_summary && !_clar.summary_filename)
-		_clar.summary_filename = strdup("summary.xml");
+		if ((_clar.summary_filename = strdup("summary.xml")) == NULL)
+			clar_abort("Failed to allocate summary filename.\n");
 
 	if (_clar.write_summary)
 	    _clar.summary = clar_summary_init(_clar.summary_filename);
@@ -681,8 +688,9 @@ void clar__fail(
 	error->line_number = line;
 	error->error_msg = error_msg;
 
-	if (description != NULL)
-		error->description = strdup(description);
+	if (description != NULL &&
+	    (error->description = strdup(description)) == NULL)
+		clar_abort("Failed to allocate description.\n");
 
 	_clar.total_errors++;
 	_clar.last_report->status = CL_TEST_FAILURE;