drm: simpledrm: fbdev emulation error with CONFIG_DRM_SIMPLEDRM enabled

["Amanoel Dawod" <kernel@xxxxxxxxxxxxxxxx>]

Hi,

This started since 5.14-rc1. The following error appears in dmesg
(as of 5.14-rc7) when I build the kernel with CONFIG_DRM_SIMPLEDRM=m

[    3.252275] [drm] Initialized simpledrm 1.0.0 20200625 for simple-framebuffer.0 on minor 0
[    3.252298] simple-framebuffer simple-framebuffer.0: [drm] *ERROR* fbdev: Failed to setup generic emulation (ret=-22)

thanks,
Amanoel