kvm tools: Drop unused vars from int10.c code

There is a couple of functions which defines 'ah' variable but never use it in real so that gcc 4.6.x series does complain on me as

CC bios/bios-rom.bin
bios/int10.c: In function ‘int10_putchar’:
bios/int10.c:86:9: error: variable ‘ah’ set but not used [-Werror=unused-but-set-variable] bios/int10.c: In function ‘int10_vesa’:
bios/int10.c:96:9: error: variable ‘ah’ set but not used [-Werror=unused-but-set-variable]
cc1: all warnings being treated as errors

so get rid of them.

---
 tools/kvm/bios/int10.c |    8 ++------
 1 file changed, 2 insertions(+), 6 deletions(-)

Index: linux-2.6.git/tools/kvm/bios/int10.c
===================================================================
@@ -83,22 +83,18 @@ static inline void outb(unsigned short p
  */
 static inline void int10_putchar(struct int10_args *args)
 {
-	u8 al, ah;
-
-	al = args->eax & 0xFF;
-	ah = (args->eax & 0xFF00) >> 8;
+	u8 al = args->eax & 0xFF;
 
 	outb(0x3f8, al);
 }
 
 static void int10_vesa(struct int10_args *args)
 {
-	u8 al, ah;
+	u8 al;
 	struct vesa_general_info *destination;
 	struct vminfo *vi;
 
 	al = args->eax;
-	ah = args->eax >> 8;
 
 	switch (al) {
 	case 0: