tun: fix build warnings
Stephen Rothwell reports a build warnings(powerpc ppc64_defconfig) drivers/net/tun.c: In function 'tun_do_read.part.5': /home/sfr/next/next/drivers/net/tun.c:1491:6: warning: 'err' may be used uninitialized in this function [-Wmaybe-uninitialized] int err; This is because tun_ring_recv() may return an uninitialized err, fix this. Reported-by: NStephen Rothwell <sfr@canb.auug.org.au> Signed-off-by: NJason Wang <jasowang@redhat.com> Signed-off-by: NDavid S. Miller <davem@davemloft.net>
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