net: qrtr: Fix error pointer vs NULL bugs

The callers only expect NULL pointers, so returning an error pointer
will lead to an Oops.

Change-Id: I7212bbd4890bbfc391b900845fa380ea484f01d7
Fixes: 0c2204a4ad71 ("net: qrtr: Migrate nameservice to kernel from userspace")
Signed-off-by: Dan Carpenter <dan.carpenter@oracle.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Git-commit: 9baeea50718fdd55c7ae4d61c15f2a71aef6e050
Git-repo: git://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git


Signed-off-by: Chris Lew <clew@codeaurora.org>