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 v5.15 by commit 2133c4fc8e1348dcb752f267a143fe2254613b34, it was introduced in version v4.0 by commit ab5b0107ccf3821a6837b0f2819270d6fa0b278f. For more details please see the references link.