[Xen-changelog] Don't increment mi->usage is alloc_major_info return NULL

[Xen patchbot -unstable <patchbot-unstable@xxxxxxxxxxxxxxxxxxx>]

# HG changeset patch
# User vh249@xxxxxxxxxxxxxxxxxxxxxxxx
# Node ID ab93a9a46bd48f9a654b1fdc9caf4b7ae07f6a8b
# Parent  8f7ee9ab31ac36c84fcf499684803e72c3eef2ef
Don't increment mi->usage is alloc_major_info return NULL

Signed-off-by: Vincent Hanquez <vincent@xxxxxxxxxxxxx>

diff -r 8f7ee9ab31ac -r ab93a9a46bd4 
linux-2.6-xen-sparse/drivers/xen/blkfront/vbd.c
--- a/linux-2.6-xen-sparse/drivers/xen/blkfront/vbd.c   Sun Oct  9 15:26:08 2005
+++ b/linux-2.6-xen-sparse/drivers/xen/blkfront/vbd.c   Sun Oct  9 16:29:24 2005
@@ -160,7 +160,8 @@
 
        mi = ((major_info[index] != NULL) ? major_info[index] :
              xlbd_alloc_major_info(major, minor, index));
-       mi->usage++;
+       if (mi)
+               mi->usage++;
        return mi;
 }
 

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