Revert now unnecessary checks for null-types

This reverts commits:

c721304a47
885d908ea3
a0909989f7
fb4ad59ddb
0a9a67cf54
0d1624d4d1
d018cfd5cb
0504fdd00b
a2fd10fe19

Conflicts:

	src/plugins/cpptools/cppcodecompletion.cpp

Reviewed-by: Roberto Raggi

src/shared/cplusplus/CheckExpression.cpp

@@ -320,8 +320,8 @@ bool CheckExpression::visit(QtMethodAST *ast)
     Scope dummy;
     FullySpecifiedType methTy = semantic()->check(ast->declarator, FullySpecifiedType(),
                                                   &dummy, &name);
-    Function *fty = 0;
-    if (! methTy || 0 == (fty = methTy->asFunctionType()))
+    Function *fty = methTy->asFunctionType();
+    if (! fty)
         translationUnit()->warning(ast->firstToken(), "expected a function declarator");
     else {
         for (unsigned i = 0; i < fty->argumentCount(); ++i) {