[Xen-devel] xl: Fix segment fault of 'xl list'

[Yu Zhiguo <yuzg@xxxxxxxxxxxxxx>]

If libxl_list_domain() returns NULL, segment fault occurs now.

Signed-off-by: Yu Zhiguo <yuzg@xxxxxxxxxxxxxx>

diff -r c87ec146229a -r 5727e3c71513 tools/libxl/xl.c
--- a/tools/libxl/xl.c  Fri Apr 23 15:04:26 2010 +0100
+++ b/tools/libxl/xl.c  Mon Apr 26 21:07:19 2010 +0800
@@ -1521,7 +1521,7 @@
 
     info = libxl_list_domain(&ctx, &nb_domain);
 
-    if (info < 0) {
+    if (!info) {
         fprintf(stderr, "libxl_domain_infolist failed.\n");
         exit(1);
     }


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