poky-qemu-ifup: allow multiple tap devices

This patch bases the tap IP address on the device number, providing
each device with its own IP address.

Signed-off-by: Jeff Dike <jdike@linux.intel.com>

scripts/poky-qemu-ifup

@@ -30,7 +30,8 @@ if [ "x$IFCONFIG" = "x" ]; then
     IFCONFIG=/sbin/ifconfig
 fi
 
-$IFCONFIG $TAP 192.168.7.1
+n=$[ `echo $TAP | sed 's/tap//'` + 1 ]
+$IFCONFIG $TAP 192.168.7.$n
 
 # setup NAT for tap0 interface to have internet access in QEMU
 IPTABLES=`which iptables`