Fixed cppcheck-opensource#4659 (portability: address value / integer false positive)

Author: danmar

lib/check64bit.cpp

@@ -68,7 +68,7 @@ void Check64BitPortability::pointerassignment()
             if (Token::Match(tok, "return %var%|%num% [;+]") && !Token::simpleMatch(tok, "return 0 ;")) {
                 enum { NO, INT, PTR, PTRDIFF } type = NO;
                 for (const Token *tok2 = tok->next(); tok2; tok2 = tok2->next()) {
-                    if ((type == NO || type == INT) && isaddr(tok2->variable()))
+                    if ((type == NO || type == INT) && Token::Match(tok2, "%var% [+;]") && isaddr(tok2->variable()))
                         type = PTR;
                     else if (type == NO && (tok2->isNumber() || isint(tok2->variable())))
                         type = INT;

test/test64bit.cpp

@@ -95,6 +95,11 @@ class Test64BitPortability : public TestFixture {
               "    *p = 0;\n"
               "}\n");
         ASSERT_EQUALS("[test.cpp:3]: (portability) Assigning an integer to a pointer is not portable.\n", errout.str());
+
+        check("int f(const char *p) {\n" // #4659
+              "    return 6 + p[2] * 256;\n"
+              "}");
+        ASSERT_EQUALS("", errout.str());
     }
 
     void structmember() {