Small cleanup.
Small cleanup.

Use exit codes more consequent. Delete the meta dir even if an
exception was thrown.

Change-Id: I87354218091b562147fbc04c20181952fdc967ca
Reviewed-by: Tim Jenssen <6a21f175c697b4129e1bafb6e9b52078bb1a6738@digia.com>

olear/qtifw,olear/qtifw,olear/qtifw,olear/qtifw