LU-14069 ldlm: Fix unbounded OBD_FAIL_LDLM_CANCEL_BL_CB_RACE wait

in ldlm_handle_cp_callback the while loop is clearly supposed
to be limited by the "to" value of 1 second, but is not.
Seems to have been broken by all the Solaris porting in HEAD
all the way back in 2008.
Restore the to assignment to make it not hang indefinitely.

Lustre-change: https://review.whamcloud.com/#/c/40375/


Lusre-commit: 5da99051

Change-Id: I449bfd7f585ab7db475fb3fd4cbbd876126ff789
Fixes: adde80ff ("Land b_head_libcfs onto HEAD")
Signed-off-by: Oleg Drokin <green@whamcloud.com>
Reviewed-on: https://review.whamcloud.com/40411


Tested-by: jenkins <devops@whamcloud.com>
Reviewed-by: Andreas Dilger <adilger@whamcloud.com>
Tested-by: Maloo <maloo@whamcloud.com>

lustre/ldlm/ldlm_lockd.c

@@ -1825,7 +1825,7 @@ static void ldlm_handle_cp_callback(struct ptlrpc_request *req,
 
 		while (to > 0) {
 			set_current_state(TASK_INTERRUPTIBLE);
-			schedule_timeout(to);
+			to = schedule_timeout(to);
 			if (ldlm_is_granted(lock) ||
 			    ldlm_is_destroyed(lock))
 				break;