staging/zcache: don't use PTR_RET().

We've already tested that it's an error.

Cc: Dan Magenheimer <dan.magenheimer@oracle.com>
Signed-off-by: Rusty Russell <rusty@rustcorp.com.au>
This commit is contained in:
Rusty Russell 2013-07-15 11:24:08 +09:30
commit 8a1d41cfea