Fix broken IRQ autoprobing in 3c503 driver:
- improper IRQ freeing (does not free IRQs causes WARN)
- missing break when an working IRQ is found
The driver works with this patch.
Signed-off-by: Ondrej Zary <linux@rainbow-software.org> Reviewed-by: Ben Hutchings <ben@decadent.org.uk> Signed-off-by: David S. Miller <davem@conan.davemloft.net>