[patch] drm: fix end of loop test

[Dan Carpenter]

"agpmem" is never NULL here because it is the list cursor of a
list_for_each_entry() list.

Signed-off-by: Dan Carpenter <error27 at gmail.com>

diff --git a/drivers/gpu/drm/drm_vm.c b/drivers/gpu/drm/drm_vm.c
index 3778360..fda6746 100644
--- a/drivers/gpu/drm/drm_vm.c
+++ b/drivers/gpu/drm/drm_vm.c
@@ -138,7 +138,7 @@ static int drm_do_vm_fault(struct vm_area_struct *vma, 
struct vm_fault *vmf)
                                break;
                }

-               if (!agpmem)
+               if (&agpmem->head == &dev->agp->memory)
                        goto vm_fault_error;

                /*