* bb.warn() should only be called once per warning - UIs such as Toaster
assume that this is the case, so adjust the output accordingly. (It's
tricky here because we have to include "log_check" on every line or
we'll end up looping forever as the log checking code's own messages
retrigger the log check, sigh...)
* Iterating over a file already splits by line, there's no need to do it
manually.
Signed-off-by: Paul Eggleton <paul.eggleton@linux.intel.com>
