null pointer dereferencing: fixed another false positive (#485)

src/checkother.cpp

@@ -1051,6 +1051,9 @@ void CheckOther::nullPointer()
                     --indentlevel2;
                 }
 
+                else if (Token::Match(tok2, "%varid% =", varid1))
+                    break;
+
                 else if (tok2->str() == "if")
                 {
                     if (Token::Match(tok2, "if ( !| %varid% )", varid1))

test/testother.cpp

@@ -488,6 +488,16 @@ private:
                          "        ;\n"
                          "}\n");
         ASSERT_EQUALS("", errout.str());
+
+        // reassign struct..
+        checkNullPointer("void foo(struct ABC *abc)\n"
+                         "{\n"
+                         "    a = abc->a;\n"
+                         "    abc = abc->next;\n"
+                         "    if (!abc)\n"
+                         "        ;\n"
+                         "}\n");
+        ASSERT_EQUALS("", errout.str());
     }
 
     void checkOldStylePointerCast(const char code[])