hrtimer: convert timerfd to the new hrtimer apis

In order to be able to do range hrtimers we need to use accessor functions
to the "expire" member of the hrtimer struct.
This patch converts timerfd to these accessors.

Signed-off-by: Arjan van de Ven <arjan@linux.intel.com>
diff --git a/fs/timerfd.c b/fs/timerfd.c
index c502c60..0862f0e 100644
--- a/fs/timerfd.c
+++ b/fs/timerfd.c
@@ -52,11 +52,9 @@
 
 static ktime_t timerfd_get_remaining(struct timerfd_ctx *ctx)
 {
-	ktime_t now, remaining;
+	ktime_t remaining;
 
-	now = ctx->tmr.base->get_time();
-	remaining = ktime_sub(ctx->tmr.expires, now);
-
+	remaining = hrtimer_expires_remaining(&ctx->tmr);
 	return remaining.tv64 < 0 ? ktime_set(0, 0): remaining;
 }
 
@@ -74,7 +72,7 @@
 	ctx->ticks = 0;
 	ctx->tintv = timespec_to_ktime(ktmr->it_interval);
 	hrtimer_init(&ctx->tmr, ctx->clockid, htmode);
-	ctx->tmr.expires = texp;
+	hrtimer_set_expires(&ctx->tmr, texp);
 	ctx->tmr.function = timerfd_tmrproc;
 	if (texp.tv64 != 0)
 		hrtimer_start(&ctx->tmr, texp, htmode);