ppc64_cpu: Correct pid checking in get/set run mode.
ppc64_cpu: Correct pid checking in get/set run mode.

The check to ensure the user invoking set/get of the run mode has
a small typo and checks for pid 0 instead of uid 0.  This corrects
this so the run mode functionality correctly works again.

Signed-off-by: Nathan Fontenot <4b7bfe500077bf77c5456931a34b0b70e36e0bc6@linux.vnet.ibm.com>

leitao/powerpc-ibm-utils-debian,mdroth/powerpc-utils,shenki/powerpc-utils,tyreld/powerpc-utils,kamalesh-babulal/powerpc-utils,leitao/powerpc-ibm-utils-debian,shenki/powerpc-utils,kamalesh-babulal/powerpc-utils,shenki/powerpc-utils,leitao/powerpc-ibm-utils-debian,tyreld/powerpc-utils,tyreld/powerpc-utils,mdroth/powerpc-utils,kamalesh-babulal/powerpc-utils,mdroth/powerpc-utils