Fixed #1268 (Null pointer dereference false positive)

lib/checkother.cpp

@@ -1278,6 +1278,9 @@ private:
 
         if (Token::Match(&tok, "%var% ("))
         {
+            if (tok.str() == "sizeof")
+                return tok.next()->link();
+
             // parse usage..
             std::list<const Token *> var;
             parseFunctionCall(tok, var, 0);

test/testother.cpp

@@ -970,6 +970,12 @@ private:
                          "        p->do_something();\n"
                          "}\n");
         ASSERT_EQUALS("", errout.str());
+
+        checkNullPointer("void foo()\n"
+                         "{\n"
+                         "    int sz = sizeof((*(struct dummy *)0).x);\n"
+                         "}\n");
+        ASSERT_EQUALS("", errout.str());
     }
 
     void nullpointer7()