Null deref fix for detect-id.c

src/detect-id.c

@@ -166,6 +166,10 @@ DetectIdData *DetectIdParse (char *idstr)
 
         orig = SCStrdup((char*)str_ptr);
         tmp_str=orig;
+        if (tmp_str == NULL) {
+            goto error;
+        }
+
         /* Let's see if we need to scape "'s */
         if (tmp_str[0] == '"')
         {