fbcon: Use kzalloc() in fbconpreparelogo()
This is an automated ID intended to aid in discovery of potential security vulnerabilities. The actual impact and attack plausibility have not yet been proven. This ID is fixed in Linux Kernel version v4.19.269 by commit 20e78b7d1c1019789d9754ad9246192916f1a3b4. For more details please see the references link.