linux/futex: Don't load a timeout when try-locking a mutex

linux_sys_futex() does not copyin a timespec for the timeout if the
operation is LINUX_FUTEX_TRYLOCK_PI, presumably because it doesn't make
sense to specify a timeout for a try-lock operation.  However, this
means that we pass a userspace timespec pointer to
linux_umtx_abs_timeout_init().

Modify linux_futex_lock_pi() to not initialize the timeout if we're
try-locking.

Reviewed by:	kib, dchagin
Reported by:	Yuxiang Yang, Yizhou Zhao, Ao Wang, Xuewei Feng, Qi Li,
		and Ke Xu from Tsinghua University using GLM-5.2 from Z.ai
MFC after:	1 week
Sponsored by:	The FreeBSD Foundation
Differential Revision:	https://reviews.freebsd.org/D58061

0 files changed, 0 insertions, 0 deletions