3c523: fix warning in drivers/net/3c523.c

fix warning:

  drivers/net/3c523.c:582: warning: ‘cleanup_card’ defined but not used

No code changed:

md5:
   ebe4a1b27d3f21b0b12a78c58463b0d7  3c523.o.before.asm
   ebe4a1b27d3f21b0b12a78c58463b0d7  3c523.o.after.asm

Signed-off-by: Ingo Molnar <mingo@elte.hu>
Signed-off-by: David S. Miller <davem@davemloft.net>