Fix strreverse: missed the NULL character at the end of reversed string

src/utils/strings.c

@@ -40,6 +40,7 @@ char *strreverse(char *result, char *s)
 	{
 		tmp[i] = s[len - i - 1];
 	}
+	tmp[len] = '\0';
 	strcpy(result, tmp);
 	free(tmp);
 	return result;