lguest: change last_guest to last_cpu

in our model, a guest does not run in a cpu anymore: a virtual cpu
does. So we change last_guest to last_cpu

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 8c72355..10eab67 100644
--- a/drivers/lguest/x86/core.c
+++ b/drivers/lguest/x86/core.c
@@ -60,7 +60,7 @@
 		  (SWITCHER_ADDR + SHARED_SWITCHER_PAGES*PAGE_SIZE))[cpu]);
 }
 
-static DEFINE_PER_CPU(struct lguest *, last_guest);
+static DEFINE_PER_CPU(struct lg_cpu *, last_cpu);
 
 /*S:010
  * We approach the Switcher.
@@ -80,8 +80,8 @@
 	 * 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_guest) != lg || lg->last_pages != pages) {
-		__get_cpu_var(last_guest) = lg;
+	if (__get_cpu_var(last_cpu) != cpu || lg->last_pages != pages) {
+		__get_cpu_var(last_cpu) = cpu;
 		lg->last_pages = pages;
 		lg->changed = CHANGED_ALL;
 	}