Description: video: fbdev: sm712fb: Fix crash in smtcfb_read()
References:
 https://bugzilla.redhat.com/show_bug.cgi?id=2105785
Notes:
Bugs:
upstream: released (5.18-rc1) [bd771cf5c4254511cc4abb88f3dab3bd58bdf8e8]
5.10-upstream-stable: released (5.10.110) [72af8810922eb143ed4f116db246789ead2d8543]
4.19-upstream-stable: released (4.19.238) [1caa40af491dcfe17b3ae870a854388d8ea01984]
sid: released (5.17.3-1)
5.10-bullseye-security: released (5.10.113-1)
4.19-buster-security: released (4.19.249-1)