disp: msm: dp: fix unused label for kalama compilation

This change fixes the unused label warning, when compiling
this driver for kalama, introduced by change
I383680c54feb826676965282e76bb3e5c3e17c4c.

Change-Id: Ia7c51fd1956b847220ebeae29a51edcc9f4dbf7e
Signed-off-by: Rajkumar Subbiah <[email protected]>

msm/dp/dp_mst_drm.c

@@ -479,6 +479,7 @@ static int _dp_mst_compute_config(struct drm_atomic_state *state,
 				connector->base.id, pbn, slots);
 		rc = slots;
 		slots = 0;
+		goto end;
 	}
 #endif