staging: rtl8723bs: core: Remove variable change_priority

Remove local variable change_priority, as it takes the value of the
argument priority; as both of these variables are of type u8, priority
can be modified without changing the value of its copy at the call site.
Issue found with Coccinelle.
Signed-off-by: Nishka Dasgupta <nishkadg.linux@gmail.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

drivers/staging/rtl8723bs/core/rtw_xmit.c

@@ -625,13 +625,11 @@ static s32 update_attrib_sec_info(struct adapter *padapter, struct pkt_attrib *p
 
 u8 qos_acm(u8 acm_mask, u8 priority)
 {
-	u8 change_priority = priority;
-
 	switch (priority) {
 	case 0:
 	case 3:
 		if (acm_mask & BIT(1))
-			change_priority = 1;
+			priority = 1;
 		break;
 	case 1:
 	case 2:
@@ -639,19 +637,19 @@ u8 qos_acm(u8 acm_mask, u8 priority)
 	case 4:
 	case 5:
 		if (acm_mask & BIT(2))
-			change_priority = 0;
+			priority = 0;
 		break;
 	case 6:
 	case 7:
 		if (acm_mask & BIT(3))
-			change_priority = 5;
+			priority = 5;
 		break;
 	default:
 		DBG_871X("qos_acm(): invalid pattrib->priority: %d!!!\n", priority);
 		break;
 	}
 
-	return change_priority;
+	return priority;
 }
 
 static void set_qos(struct pkt_file *ppktfile, struct pkt_attrib *pattrib)