. Use calloc when allocating objects.
. Use malloc when allocating a buffer that we are about to completely fill.
. In both cases, NULL check the result, unless using X built-in "kill server
on alloc fail" versions (e.g., xnfcalloc())
. The canonical way to call calloc is:
  ptr = calloc(nelem, sizeof *ptr); /* or sizeof(*ptr) */
  if (ptr) {
      /* Handle OOM */
  }

. Don't NULL check before calling free().

BUG=none
TEST=compiles clean; sanity check ui on device

(cherry picked from commit 79795728e366a56013aa4affa2d42128441a5eb9)
From: https://chromium.googlesource.com/chromiumos/third_party/xf86-video-armsoc

Change-Id: I18b6a6c7c173c0120ec6da948b1e55cbe96e1e1d