usb: gadget: serial: mark expected switch fall-through

In preparation to enabling -Wimplicit-fallthrough, mark switch cases
where we are expecting to fall through.

Addresses-Coverity-ID: 1350962
Signed-off-by: Gustavo A. R. Silva <garsilva@embeddedor.com>
Signed-off-by: Felipe Balbi <felipe.balbi@linux.intel.com>
This commit is contained in:
Gustavo A. R. Silva 2017-10-23 22:15:46 -05:00 • committed by Felipe Balbi
commit fdb5e4fa1a