Initialize QFileSystemMetaData::size_ data member

There's a code path which reads that member before it got anything
assigned to it, triggering undefined behavior.

The code path goes as follows:

1. an instance is created in QFSFileEngineIterator::advance
2. the instance is passed to QFileSystemIterator::advance, which fills in
   only some members (not size_)
3. the instance is passed to QFileInfoPrivate which does a deep copy,
   reading an uninitialized size_

Change-Id: I6835ee701a83b63ca4bad6235feeb6a23566fcd3
Reviewed-by: Marc Mutz <marc.mutz@kdab.com>
Reviewed-by: Thiago Macieira <thiago.macieira@intel.com>

src/corelib/io/qfilesystemmetadata_p.h

@@ -74,7 +74,8 @@ class QFileSystemMetaData
 {
 public:
     QFileSystemMetaData()
-        : knownFlagsMask(0)
+        : knownFlagsMask(0),
+          size_(-1)
     {
     }