drmgr: Correct null pointer usage
drmgr: Correct null pointer usage

We can't de-reference NULL pointers, it's not a nice thing to do.

I found these during some debugging, correcting to avoid future bugs.

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

shenki/powerpc-utils,shenki/powerpc-utils,kamalesh-babulal/powerpc-utils,kamalesh-babulal/powerpc-utils,shenki/powerpc-utils,kamalesh-babulal/powerpc-utils