Impact: Remove redundant inner scope variable.

Fix this sparse warning:
  drivers/net/s2io.c:7223:21: warning: symbol 'i' shadows an earlier one
  drivers/net/s2io.c:7184:13: originally declared here
Signed-off-by: NHannes Eder <hannes@hanneseder.net>
Signed-off-by: NDavid S. Miller <davem@davemloft.net>