drm/vmwgfx: Fix compat shader namespace

[Dan Carpenter]

Hello Thomas Hellstrom,

The patch 18e4a4669c50: "drm/vmwgfx: Fix compat shader namespace"
from Jun 9, 2014, leads to the following static checker warning:

	drivers/gpu/drm/vmwgfx/vmwgfx_execbuf.c:477 vmw_cmd_res_reloc_add()
	warn: missing error code here? 'kzalloc()' failed.

drivers/gpu/drm/vmwgfx/vmwgfx_execbuf.c
   468  
   469                  ret = vmw_resource_context_res_add(dev_priv, sw_context, res);
   470                  if (unlikely(ret != 0))
   471                          goto out_err;
   472                  node->staged_bindings =
   473                          kzalloc(sizeof(*node->staged_bindings), GFP_KERNEL);
   474                  if (node->staged_bindings == NULL) {
   475                          DRM_ERROR("Failed to allocate context binding "
   476                                    "information.\n");
   477                          goto out_err;

This should just be "return -ENOMEM;".  The goto is misleading because
you expect it to do something useful.

Soon checkpatch.pl will start complaining about the extra DRM_ERROR()
because kzalloc() has a more useful printk builtin and this just wastes
memory and makes the code more verbose.

Speaking of verbose, all the likely/unlikely annotations should be
removed.  If the code were more readable then the missing error code
would have been more noticeable.  This code is buggy because it is ugly;
there is a direct cause effect relationship.

   478                  }
   479                  INIT_LIST_HEAD(&node->staged_bindings->list);
   480          }
   481  
   482          if (p_val)
   483                  *p_val = node;
   484  
   485  out_err:
   486          return ret;
   487  }

regards,
dan carpenter