staging: rtl8723au: use swap() in WMMOnAssocRsp23a()

Use kernel.h macro definition.

Thanks to Julia Lawall for Coccinelle scripting support.
Signed-off-by: Fabian Frederick <fabf@skynet.be>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

drivers/staging/rtl8723au/core/rtw_wlan_util.c

@@ -573,7 +573,7 @@ void WMMOnAssocRsp23a(struct rtw_adapter *padapter)
 	inx[0] = 0; inx[1] = 1; inx[2] = 2; inx[3] = 3;
 
 	if (pregpriv->wifi_spec == 1) {
-		u32 j, tmp, change_inx = false;
+		u32 j, change_inx = false;
 
 		/* entry indx: 0->vo, 1->vi, 2->be, 3->bk. */
 		for (i = 0; i < 4; i++) {
@@ -589,14 +589,8 @@ void WMMOnAssocRsp23a(struct rtw_adapter *padapter)
 				}
 
 				if (change_inx) {
-					tmp = edca[i];
-					edca[i] = edca[j];
-					edca[j] = tmp;
-
-					tmp = inx[i];
-					inx[i] = inx[j];
-					inx[j] = tmp;
-
+					swap(edca[i], edca[j]);
+					swap(inx[i], inx[j]);
 					change_inx = false;
 				}
 			}