disp: msm: sde: propagate the error code in dual display TUI cases

Propagate error in case the number of active displays is greater
than 1, in dual display scenario to fail the validate.

Change-Id: I04250af8d7a6b0c290132abbaed2ed8e5e311a4f
Signed-off-by: Raviteja Tamatam <quic_travitej@quicinc.com>

msm/sde/sde_kms.c

@@ -5342,6 +5342,7 @@ int sde_kms_vm_trusted_resource_init(struct sde_kms *sde_kms,
 	if (sde_kms->splash_data.num_splash_displays != 1) {
 		SDE_ERROR("no. of displays not supported:%d\n",
 				sde_kms->splash_data.num_splash_displays);
+		ret = -EINVAL;
 		goto error;
 	}