drm/amd/display: Do not program interrupt status on disabled crtc

Prevent interrupt programming of a crtc on which the stream is disabled and
it doesn't have an OTG to reference.
Signed-off-by: Mikita Lipski <mikita.lipski@amd.com>
Reviewed-by: Harry Wentland <Harry.Wentland@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>

drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm_irq.c

@@ -555,6 +555,9 @@ static inline int dm_irq_state(struct amdgpu_device *adev,
 		return 0;
 	}
 
+	if (acrtc->otg_inst == -1)
+		return 0;
+
 	irq_source = dal_irq_type + acrtc->otg_inst;
 
 	st = (state == AMDGPU_IRQ_STATE_ENABLE);