[PATCH 1/4] tools/libxl: Avoid deliberate NULL pointer dereference

[Andrew Cooper <andrew.cooper3@citrix.com>]

Coverity ID: 1055290

Calling LIBXL__LOG_ERRNO(ctx,) with a ctx pointer we have just failed to
allocate is going to end badly.  Opencode a suitable use of xtl_log() instead.

Signed-off-by: Andrew Cooper <andrew.cooper3@citrix.com>
CC: Ian Campbell <Ian.Campbell@citrix.com>
CC: Ian Jackson <Ian.Jackson@eu.citrix.com>
---
 tools/libxl/libxl.c |    4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/tools/libxl/libxl.c b/tools/libxl/libxl.c
index 9b93262..6263d14 100644
--- a/tools/libxl/libxl.c
+++ b/tools/libxl/libxl.c
@@ -31,7 +31,9 @@ int libxl_ctx_alloc(libxl_ctx **pctx, int version,
 
     ctx = malloc(sizeof(*ctx));
     if (!ctx) {
-        LIBXL__LOG_ERRNO(ctx, LIBXL__LOG_ERROR, "Failed to allocate context\n");
+        xtl_log(lg, XTL_ERROR, errno, "libxl",
+                "%s:%d:%s: Failed to allocate context\n",
+                __FILE__, __LINE__, __func__);
         rc = ERROR_NOMEM; goto out;
     }
 
-- 
1.7.10.4