[SeaBIOS] [PATCH] Xen: add definition of xen_hypercall_page

[Ian Campbell]

commit b7d9abfaeb7d (correctly) added the missing "extern" to the declaration
in xen.h, however it turns out we never actually declared the variable!

Signed-off-by: Ian Campbell 
---
 src/xen.c |    1 +
 1 files changed, 1 insertions(+), 0 deletions(-)

diff --git a/src/xen.c b/src/xen.c
index 128e6c0..9905009 100644
--- a/src/xen.c
+++ b/src/xen.c
@@ -14,6 +14,7 @@
 #define INFO_PHYSICAL_ADDRESS 0x00001000

u32 xen_cpuid_base = 0;
+unsigned long xen_hypercall_page = 0;

struct xen_seabios_info {
     char signature[14]; /* XenHVMSeaBIOS\0 */