ppc64_cpu: free core_state on error
ppc64_cpu: free core_state on error

Make sure we free the allocated 'core_state', issue found with Coverity.

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

shenki/powerpc-utils,shenki/powerpc-utils,shenki/powerpc-utils