Fixed zero-length packet warning on party member logoff. Fixes #7324 (#7339)

Co-authored-by: Aleos <aleos89@users.noreply.github.com>

src/map/clif.cpp

@@ -10164,15 +10164,17 @@ void clif_disp_overhead_(struct block_list *bl, const char* mes, enum send_targe
  * Minimap fix [Kevin]
  * Remove dot from minimap
  *--------------------------*/
-void clif_party_xy_remove(struct map_session_data *sd)
+void clif_party_xy_remove(struct map_session_data* sd)
 {
-	unsigned char buf[16];
 	nullpo_retv(sd);
-	WBUFW(buf,0)=0x107;
-	WBUFL(buf,2)=sd->status.account_id;
-	WBUFW(buf,6)=-1;
-	WBUFW(buf,8)=-1;
-	clif_send(buf,packet_len(0x107),&sd->bl,PARTY_SAMEMAP_WOS);
+
+	PACKET_ZC_NOTIFY_POSITION_TO_GROUPM p{};
+	p.PacketType = HEADER_ZC_NOTIFY_POSITION_TO_GROUPM;
+	p.AID = sd->status.account_id;
+	p.xPos = -1;
+	p.yPos = -1;
+
+	clif_send(&p, sizeof(p), &sd->bl, PARTY_SAMEMAP_WOS);
 }