File if_this.patch of Package abuse

--- src1/lisp/lisp.cpp	2011-05-02 14:55:06.000000000 +0300
+++ src/lisp/lisp.cpp	2022-05-25 11:25:20.817592183 +0300
@@ -3080,7 +3080,7 @@
 
     LObject *ret = NULL;
 
-    if (this)
+    volatile auto xex = this; if(xex)
     {
         switch (item_type(this))
         {
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