pcmcia/3c574_cs: fix 'shadow variable' warning

Fixing:
  CHECK   drivers/net/pcmcia/3c574_cs.c
drivers/net/pcmcia/3c574_cs.c:695:7: warning: symbol 'i' shadows an earlier one
drivers/net/pcmcia/3c574_cs.c:636:6: originally declared here

Signed-off-by: Richard Knutson <ricknu-0@student.ltu.se>
Acked-by: Alan Cox <alan@redhat.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>