This patch reorganizes resource flags to ensure that manual resource
settings are properly recognized.  This fix is necessary for many ALSA
drivers.  It also prevents comparisons between unset resource
structures.  The bug was discovered by Rene Herman
<rene.herman@keyaccess.nl>, who also wrote an initial version of this
patch.  I made further improvements to ensure that the pnp subsystem 
was compatible with this initial change.