wifi: brcmsmac: ampdu: remove unused suc_mpdu variable

clang with W=1 reports
drivers/net/wireless/broadcom/brcm80211/brcmsmac/ampdu.c:848:5: error: variable
'suc_mpdu' set but not used [-Werror,-Wunused-but-set-variable]
u8 suc_mpdu = 0, tot_mpdu = 0;
^
This variable is not used so remove it.

Signed-off-by: Tom Rix <[e-mail]>
Reviewed-by: Simon Horman <[e-mail]>
Signed-off-by: Kalle Valo <[e-mail]>
Link: https://lore.kernel.org/r/[e-mail]

drivers/net/wireless/broadcom/brcm80211/brcmsmac/ampdu.c

···
 	u16 seq, start_seq = 0, bindex, index, mcl;
 	u8 mcs = 0;
 	bool ba_recd = false, ack_recd = false;
-	u8 suc_mpdu = 0, tot_mpdu = 0;
+	u8 tot_mpdu = 0;
 	uint supr_status;
 	bool retry = true;
 	u16 mimoantsel = 0;
···
 				ieee80211_tx_status_irqsafe(wlc->pub->ieee_hw,
 							    p);
 				ack_recd = true;
-				suc_mpdu++;
 			}
 		}
 		/* either retransmit or send bar if ack not recd */