Possible null pointer dereference

Hi.

Please look this code fragment:

if (!pixmap() && !pixmap()->isNull())
  return pixmap()->size();

if pixmap() returns NULL, !pixmap() will be true, si pixmap()->isNull() will be executed.

Probably, it should be:

if (pixmap() && !pixmap()->isNull())
  return pixmap()->size();

This possible defect found by AppChecker