LU-17812 coverity: Fixes Boolean operation on a constant

LU-17812 coverity: Fixes Boolean operation on a constant

This commit fixes the coverity issue introduced by the
previous commit of LU-17812. Below given is the coverity
report.
CID 440624 Integer handling issue constant_expression_result
The expression "ldlm_lock_to_ns(__ext->oe_dlmlock)->
ns_dump_stack_on_error && 1 /* D_ERROR & D_ERROR */" performs a
Boolean operation on a constant

Fixes: 70b9dc57a99d ("LU-17812 ldlm: stack trace log for LDLM error")
Signed-off-by: Rajeev Mishra <rajeevm@hpe.com>
Change-Id: I300831598c54f3f96719938253c7eaacb83f299f
Reviewed-on: https://review.whamcloud.com/c/fs/lustre-release/+/55926
Tested-by: Maloo <maloo@whamcloud.com>
Tested-by: jenkins <devops@whamcloud.com>
Reviewed-by: Petros Koutoupis <petros.koutoupis@hpe.com>
Reviewed-by: Shaun Tancheff <shaun.tancheff@hpe.com>
Reviewed-by: Oleg Drokin <green@whamcloud.com>
Reviewed-by: Andreas Dilger <adilger@whamcloud.com>