gummiboot.bbclass: Use bb.fatal() instead of raising FuncFailed
This sets a good example and avoids unnecessarily contributing to
perceived complexity and cargo culting.
Motivating quote below:
< kergoth> the *original* intent was for the function/task to error via
whatever appropriate means, bb.fatal, whatever, and
funcfailed was what you'd catch if you were calling
exec_func/exec_task. that is, it's what those functions
raise, not what metadata functions should be raising
< kergoth> it didn't end up being used that way
< kergoth> but there's really never a reason to raise it yourself
FuncFailed.__init__ takes a 'name' argument rather than a 'msg'
argument, which also shows that the original purpose got lost.
Signed-off-by: Ulf Magnusson <ulfalizer@gmail.com> Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>
