WAN: flush tx_queue in hdlc_ppp to prevent panic on rmmod hw_driver.

WAN: flush tx_queue in hdlc_ppp to prevent panic on rmmod hw_driver.

[ Upstream commit 31f634a63de7068c6a5dcb0d7b09b24b61a5cf88 ]

tx_queue is used as a temporary queue when not allowed to queue skb
directly to the hw device driver (which may sleep). Most paths flush
it before returning, but ppp_start() currently cannot. Make sure we
don't leave skbs pointing to a non-existent device.

Thanks to Michael Barkowski for reporting this problem.

Signed-off-by: Krzysztof Hałasa <khc@pm.waw.pl>
Signed-off-by: David S. Miller <davem@davemloft.net>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>