drm/msm/disp/dpu1: avoid clearing hw interrupts if hw_intr is null during drm uninit

In the Linux kernel, the following vulnerability has been resolved:

drm/msm/disp/dpu1: avoid clearing hw interrupts if hw_intr is null during drm uninit

If edp modeset init is failed due to panel being not ready and

probe defers during drm bind, avoid clearing irqs and dereference

hw_intr when hw_intr is null.

BUG: Unable to handle kernel NULL pointer dereference at virtual address 0000000000000000

Call trace:

dpu_core_irq_uninstall+0x50/0xb0

dpu_irq_uninstall+0x18/0x24

msm_drm_uninit+0xd8/0x16c

msm_drm_bind+0x580/0x5fc

try_to_bring_up_master+0x168/0x1c0

__component_add+0xb4/0x178

component_add+0x1c/0x28

dp_display_probe+0x38c/0x400

platform_probe+0xb0/0xd0

really_probe+0xcc/0x2c8

__driver_probe_device+0xbc/0xe8

driver_probe_device+0x48/0xf0

__device_attach_driver+0xa0/0xc8

bus_for_each_drv+0x8c/0xd8

__device_attach+0xc4/0x150

device_initial_probe+0x1c/0x28

Changes in V2:

- Update commit message and coreect fixes tag.

Patchwork: https://patchwork.freedesktop.org/patch/484430/