[kvm-unit-tests PATCH] x86: fix build with GCC10

[Vitaly Kuznetsov <vkuznets@redhat.com>]

kvm-unit-tests fail to build with GCC10:

/usr/bin/ld: lib/libcflat.a(usermode.o):
  ./kvm-unit-tests/lib/x86/usermode.c:17:  multiple definition of `jmpbuf';
 lib/libcflat.a(fault_test.o):
  ./kvm-unit-tests/lib/x86/fault_test.c:3: first defined here

It seems that 'jmpbuf' doesn't need to be global in either of these files,
make it static in both.

Signed-off-by: Vitaly Kuznetsov <vkuznets@redhat.com>
---
 lib/x86/fault_test.c | 2 +-
 lib/x86/usermode.c   | 2 +-
 2 files changed, 2 insertions(+), 2 deletions(-)

diff --git a/lib/x86/fault_test.c b/lib/x86/fault_test.c
index 078dae3da640..e15a21864562 100644
--- a/lib/x86/fault_test.c
+++ b/lib/x86/fault_test.c
@@ -1,6 +1,6 @@
 #include "fault_test.h"
 
-jmp_buf jmpbuf;
+static jmp_buf jmpbuf;
 
 static void restore_exec_to_jmpbuf(void)
 {
diff --git a/lib/x86/usermode.c b/lib/x86/usermode.c
index f01ad9be1799..f0325236dd05 100644
--- a/lib/x86/usermode.c
+++ b/lib/x86/usermode.c
@@ -14,7 +14,7 @@
 #define USERMODE_STACK_SIZE	0x2000
 #define RET_TO_KERNEL_IRQ	0x20
 
-jmp_buf jmpbuf;
+static jmp_buf jmpbuf;
 
 static void restore_exec_to_jmpbuf(void)
 {
-- 
2.25.4