lguest: use bool instead of int

Impact: clean up

Rusty told me, some time ago, that he had become a fan of "bool".
So, here are some replacements.

Signed-off-by: Matias Zabaljauregui <zabaljauregui at gmail.com>
Signed-off-by: Rusty Russell <rusty@rustcorp.com.au>
diff --git a/drivers/lguest/segments.c b/drivers/lguest/segments.c
index ec6aa3f..4f15439 100644
--- a/drivers/lguest/segments.c
+++ b/drivers/lguest/segments.c
@@ -45,7 +45,7 @@
  * "Task State Segment" which controls all kinds of delicate things.  The
  * LGUEST_CS and LGUEST_DS entries are reserved for the Switcher, and the
  * the Guest can't be trusted to deal with double faults. */
-static int ignored_gdt(unsigned int num)
+static bool ignored_gdt(unsigned int num)
 {
 	return (num == GDT_ENTRY_TSS
 		|| num == GDT_ENTRY_LGUEST_CS