GFS2: Replace PTR_RET with PTR_ERR_OR_ZERO

PTR_RET should be PTR_ERR

Reported-by: Sachin Kamat <sachin.kamat@linaro.org>
Cc: Rusty Russell <rusty@rustcorp.com.au>
Signed-off-by: Steven Whitehouse <swhiteho@redhat.com>
Signed-off-by: Rusty Russell <rusty@rustcorp.com.au>
1 file changed