drm/msm: Fix null pointer dereference on pointer edp
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 v4.19.213 by commit 7f642b93710b6b1119bdff90be01e6b5a2a5d669, it was introduced in version v4.0 by commit ab5b0107ccf3821a6837b0f2819270d6fa0b278f. For more details please see the references link.