CVE-2022-50404 fbdev: fbcon: release buffer when fbcon_do_set_font() failed

In the Linux kernel, the following vulnerability has been resolved: fbdev: fbcon: release buffer when fbcondosetfont failed syzbot is reporting memory leak at fbcondosetfont 1, for commit a5a923038d70 "fbdev: fbcon: Properly revert changes when vcresize failed" missed that the buffer might be new...