fast-classifier.c: eliminate compile warnings (may be a potential bug)

The relevant warning messages are as follows:
  CC [M]  drivers/net/ethernet/qualcomm/sfe/shortcut-fe/sfe_cm.o
  CC [M]  drivers/net/ethernet/qualcomm/sfe/fast-classifier/fast-classifier.o
  AR [M]  drivers/net/ethernet/qualcomm/sfe/shortcut-fe/shortcut-fe-cm.o
  LTO [M] drivers/net/ethernet/qualcomm/sfe/shortcut-fe/shortcut-fe-cm.lto.o
drivers/net/ethernet/qualcomm/sfe/fast-classifier/fast-classifier.c:1486:20: warning: converting the enum constant to a boolean [-Wint-in-bool
-context]
                if (sis->src_dev && IFF_EBRIDGE &&
                                 ^
drivers/net/ethernet/qualcomm/sfe/fast-classifier/fast-classifier.c:1494:21: warning: converting the enum constant to a boolean [-Wint-in-bool
-context]
                if (sis->dest_dev && IFF_EBRIDGE &&
                                  ^
2 warnings generated.
  LTO [M] drivers/net/ethernet/qualcomm/sfe/fast-classifier/fast-classifier.lto.o

drivers/net/ethernet/qualcomm/sfe/fast-classifier/Makefile

@@ -8,3 +8,4 @@ ifeq ($(CONFIG_SFE_SUPPORT_IPV6),y)
 endif
 
 ccflags-y += -I$(obj)/../shortcut-fe
+ccflags-y += -Werror -Wall

drivers/net/ethernet/qualcomm/sfe/fast-classifier/fast-classifier.c

@@ -1483,15 +1483,15 @@ static void fast_classifier_sync_rule(struct sfe_connection_sync *sis)
 		nlstats.tx_packets = 0;
 		nlstats.tx_bytes = 0;
 
-		if (sis->src_dev && IFF_EBRIDGE &&
+		if ((sis->src_dev->priv_flags & IFF_EBRIDGE) &&
 		    (sis->src_new_packet_count || sis->src_new_byte_count)) {
 			nlstats.rx_packets = sis->src_new_packet_count;
 			nlstats.rx_bytes = sis->src_new_byte_count;
 			spin_lock_bh(&sfe_connections_lock);
 			br_dev_update_stats(sis->src_dev, &nlstats);
 			spin_unlock_bh(&sfe_connections_lock);
 		}
-		if (sis->dest_dev && IFF_EBRIDGE &&
+		if ((sis->dest_dev->priv_flags & IFF_EBRIDGE) &&
 		    (sis->dest_new_packet_count || sis->dest_new_byte_count)) {
 			nlstats.rx_packets = sis->dest_new_packet_count;
 			nlstats.rx_bytes = sis->dest_new_byte_count;