[QFontDatabase] Get rid of some dead code

1. Checking if `db->count == 0` inside the
`for (int x = 0; x < db->count; ++x)` loop makes absolutely no sense;
2. The family gets loaded just a line above (ensurePopulated()).

Change-Id: I72dbd42565c4f5a5d9ff8879f10ee0ece7298fa7
Reviewed-by: Simon Hausmann <simon.hausmann@theqtcompany.com>

src/gui/text/qfontdatabase.cpp

@@ -1181,9 +1181,6 @@ static int match(int script, const QFontDef &request,
 
         test.family->ensurePopulated();
 
-        if (family_name.isEmpty())
-            load(test.family->name, script);
-
         // Check if family is supported in the script we want
         if (writingSystem != QFontDatabase::Any && !(test.family->writingSystems[writingSystem] & QtFontFamily::Supported))
             continue;