drm/dp_mst: Don't return error code when crtc is null

[Why]
In certain cases the crtc can be NULL and returning -EINVAL causes
atomic check to fail when it shouln't. This leads to valid
configurations failing because atomic check fails.

[How]
Don't early return if crtc is null

Signed-off-by: Bhawanpreet Lakha <[e-mail]>
Reviewed-by: Lyude Paul <[e-mail]>
[added stable cc]
Signed-off-by: Lyude Paul <[e-mail]>
Fixes: 8ec046716ca8 ("drm/dp_mst: Add helper to trigger modeset on affected DSC MST CRTCs")
Cc: <[e-mail]> # v5.6+
Link: https://patchwork.freedesktop.org/patch/msgid/[e-mail]

drivers/gpu/drm/drm_dp_mst_topology.c

···
 
 		crtc = conn_state->crtc;
 
-		if (WARN_ON(!crtc))
-			return -EINVAL;
+		if (!crtc)
+			continue;
 
 		if (!drm_dp_mst_dsc_aux_for_port(pos->port))
 			continue;