Fix infinite loop due to unsigned integer overflow.
Fix infinite loop due to unsigned integer overflow.

In get_binding_keycode() a uint8_t loop variable was incremented in a
for loop.  The variable would overflow right before the loop's
condition was met.  Therefore the loop would never terminate.

To avoid the infinite loop the condition has to be checked before the
increment operation and not afterwards.

conformal/spectrwm,conformal/spectrwm,conformal/spectrwm