Fix up valgrind memcheck after GPFS handle key was changed

Signed-off-by: Frank Filz <ffilz@us.ibm.com>
Fix return code from cache_inode_commit

Normally somehow this doesn't cause a problem, but under certain
memory situations, the problem was exposed. Fix is clear from
code inspection...

Signed-off-by: Frank Filz <ffilz@us.ibm.com>