packagefs: Just set cache->virtual_end rather than using Resize().

Resize() has extra logic to deal with shrinking the cache and
adding commitments, neither of which we need here.

src/add-ons/kernel/file_systems/packagefs/package/CachedDataReader.cpp

@@ -113,12 +113,7 @@ CachedDataReader::Init(BAbstractBufferedDataReader* reader, off_t size)
 	if (error != B_OK)
 		RETURN_ERROR(error);
 
-	AutoLocker<VMCache> locker(fCache);
+	fCache->virtual_end = size;
-
-	error = fCache->Resize(size, VM_PRIORITY_SYSTEM);
-	if (error != B_OK)
-		RETURN_ERROR(error);
-
 	return B_OK;
 }