There are two issue here.
1) cnt starts as maxloop + 1 so all these loops iterate one more time
2) At the end of the loop we test for "if (maxloop && !cnt)" but for
the first two loops, we end with cnt equal to -1. Changing this to
a pre-op means we end with cnt set to 0.
Fixes: cae86d4a ('mISDN: Add driver for Infineon ISDN chipset family')
Signed-off-by: Dan Carpenter <firstname.lastname@example.org>
Signed-off-by: David S. Miller <email@example.com>