Backport a fix from upstream for a -Wformat-truncation=2 warning
and implement a simple fix for a -Wimplicit-fallthrough warning.
(From OE-Core rev: aaf4c4f3d09ac3897205417eb15e19d54e0c0d05)
Signed-off-by: Joshua Lock <joshua.g.lock@intel.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>