lguest: move last_pages to lg_cpu

in our new model, pages are assigned to a virtual cpu, not to a guest.
We move it to the lg_cpu structure.

Signed-off-by: Glauber de Oliveira Costa <gcosta@redhat.com>
Signed-off-by: Rusty Russell <rusty@rustcorp.com.au>
diff --git a/drivers/lguest/x86/core.c b/drivers/lguest/x86/core.c
index 10eab67..f8dfdc9 100644
--- a/drivers/lguest/x86/core.c
+++ b/drivers/lguest/x86/core.c
@@ -80,9 +80,9 @@
 	 * same Guest we ran last time (and that Guest hasn't run anywhere else
 	 * meanwhile).  If that's not the case, we pretend everything in the
 	 * Guest has changed. */
-	if (__get_cpu_var(last_cpu) != cpu || lg->last_pages != pages) {
+	if (__get_cpu_var(last_cpu) != cpu || cpu->last_pages != pages) {
 		__get_cpu_var(last_cpu) = cpu;
-		lg->last_pages = pages;
+		cpu->last_pages = pages;
 		lg->changed = CHANGED_ALL;
 	}