drm/nv50/pm: use hwsq for engine reclocking too

[Dan Carpenter]

Hello Ben Skeggs,

The patch 496a73bbecb8: "drm/nv50/pm: use hwsq for engine reclocking 
too" from Jan 24, 2012, leads to the following Smatch warning:
"drivers/gpu/drm/nouveau/nv50_pm.c:638 nv50_pm_clocks_pre()
	 warn: 'info->mmast' might be uninitialized"

[ This Smatch check isn't ready for release yet ].

drivers/gpu/drm/nouveau/nv50_pm.c
   621  
   622          info = kmalloc(sizeof(*info), GFP_KERNEL);
   623          if (!info)
   624                  return ERR_PTR(-ENOMEM);
   625          info->perflvl = perflvl;
   626  
   627          /* memory: build hwsq ucode which we'll use to reclock memory.
   628           *         use pcie refclock if possible, otherwise use mpll */
   629          info->mclk_hwsq.len = 0;
   630          if (perflvl->memory) {
   631                  ret = calc_mclk(dev, perflvl, info);
   632                  if (ret)
   633                          goto error;
   634                  info->mscript = perflvl->memscript;
   635          }
   636  
   637          divs = read_div(dev);
   638          mast = info->mmast;
                       ^^^^^^^^^^^
My reading is that "info" is setup inside calc_mclk() so if
perflvl->memory is false then info->mmast isn't set.

regards,
dan carpenter