msm: eva: Fix Kw p1 issue

Validate s->next is not NULL before dereferencing

Change-Id: I8112eb20aab939b917243e283583ab9d0884e3e8
Signed-off-by: Jingyu Su <quic_jingyus@quicinc.com>

msm/eva/msm_cvp_dsp.c

@@ -602,7 +602,7 @@ static void cvp_remove_dsp_sessions(void)
 
 	while ((frpc_node = pop_frpc_node())) {
 		s = &frpc_node->dsp_sessions.list;
-		if (!s)
+		if (!s || !(s->next))
 			return;
 		list_for_each_safe(s, next_s,
 				&frpc_node->dsp_sessions.list) {