[xen staging-4.16] tools/helpers: fix build of xen-init-dom0 with -Werror

[patchbot@xxxxxxx]

commit 14fd97e3de939a63a6e467f240efb49fe226a5dc
Author:     Anthony PERARD <anthony.perard@xxxxxxxxxx>
AuthorDate: Tue Jul 12 11:16:10 2022 +0200
Commit:     Jan Beulich <jbeulich@xxxxxxxx>
CommitDate: Tue Jul 12 11:16:10 2022 +0200

    tools/helpers: fix build of xen-init-dom0 with -Werror
    
    Missing prototype of asprintf() without _GNU_SOURCE.
    
    Signed-off-by: Anthony PERARD <anthony.perard@xxxxxxxxxx>
    Reviewed-by: Henry Wang <Henry.Wang@xxxxxxx>
    master commit: d693b22733044d68e9974766b5c9e6259c9b1708
    master date: 2022-07-12 08:38:35 +0200
---
 tools/helpers/xen-init-dom0.c | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/tools/helpers/xen-init-dom0.c b/tools/helpers/xen-init-dom0.c
index c99224a4b6..b4861c9e80 100644
--- a/tools/helpers/xen-init-dom0.c
+++ b/tools/helpers/xen-init-dom0.c
@@ -1,3 +1,5 @@
+#define _GNU_SOURCE
+
 #include <stdlib.h>
 #include <stdint.h>
 #include <string.h>
--
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