/drivers/isdn/

efined as __attribute__ ((fallthrough)) for versions of gcc that support it (i.e. gcc 7 and newer) or as a nop for versions that do not. Replace "fallthrough" comments with fallthrough reserved word. Signed-off-by: Bruce Allan Signed-off-by: Tony Nguyen Tested-by: Andrew Bowers Signed-off-by: Jeff Kirsher ---