[QETH]: fix qeth_main.c

drivers/s390/net/qeth_main.c: In function 'qeth_hard_header_parse':
drivers/s390/net/qeth_main.c:6584: error: 'dev' undeclared (first use in this function)
drivers/s390/net/qeth_main.c:6584: error: (Each undeclared identifier is reported only once
drivers/s390/net/qeth_main.c:6584: error: for each function it appears in.)

Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: David S. Miller <davem@davemloft.net>