staging: lustre: fix sparse warning "unexpected unlock"

Fix the following warning in lib-eq.c
warning: context imbalance in 'lnet_eq_wait_locked' - unexpected unlock
Signed-off-by: NToby Smith <toby@tismith.id.au>
Signed-off-by: NGreg Kroah-Hartman <gregkh@linuxfoundation.org>

drivers/staging/lustre/lnet/lnet/lib-eq.c

@@ -325,6 +325,7 @@ EXPORT_SYMBOL(LNetEQWait);
 
 static int
 lnet_eq_wait_locked(int *timeout_ms)
+__must_hold(&the_lnet.ln_eq_wait_lock)
 {
 	int		tms = *timeout_ms;
 	int		wait;