[PATCH 05/10] tools/libxl: Fix uninitialised variable in libxl__write_stub_dmargs()

[Andrew Cooper <andrew.cooper3@xxxxxxxxxx>]

Various version of gcc, when compiling with -Og, complain:

  libxl_dm.c: In function ‘libxl__write_stub_dmargs’:
  libxl_dm.c:2166:16: error: ‘dmargs’ may be used uninitialized in this 
function [-Werror=maybe-uninitialized]
               rc = libxl__xs_write_checked(gc, t, path, dmargs);
               ~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

It can't, but only because of how the is_linux_stubdom checks line up.

Signed-off-by: Andrew Cooper <andrew.cooper3@xxxxxxxxxx>
---
CC: Ian Jackson <iwj@xxxxxxxxxxxxxx>
CC: Wei Liu <wl@xxxxxxx>
CC: Anthony PERARD <anthony.perard@xxxxxxxxxx>
---
 tools/libs/light/libxl_dm.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/tools/libs/light/libxl_dm.c b/tools/libs/light/libxl_dm.c
index 1ca21e4b81..7bbb8792ea 100644
--- a/tools/libs/light/libxl_dm.c
+++ b/tools/libs/light/libxl_dm.c
@@ -2099,7 +2099,7 @@ static int libxl__write_stub_dmargs(libxl__gc *gc,
 {
     struct xs_permissions roperm[2];
     xs_transaction_t t = XBT_NULL;
-    char *dmargs;
+    char *dmargs = NULL;
     int rc;
 
     roperm[0].id = 0;
-- 
2.11.0