sanity.bbclass: echo current SDK_VENDOR if it is invalid
It can be frustrating if this sanity check triggers, but you
don't know why; you haven't explicitly set any SDK vars, or
similar.
At least echo out the offending value, so the end user has
a bit more information to go on.
Before:
SDK_VENDOR should be of the form '-foosdk' with a single dash
After:
SDK_VENDOR should be of the form '-foosdk' with a single dash; found '-overc-sdk'
Cc: Ross Burton <ross.burton@intel.com> Signed-off-by: Paul Gortmaker <paul.gortmaker@windriver.com> Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>
