gpu: ion: Fix bug in zeroing pages in system heap
gpu: ion: Fix bug in zeroing pages in system heap

Pages are zeroed for security purposes when returned to the
ion heap.  There was a bug in this code preventing this
from happening.

Bug: 7573871
Change-Id: I2b363924b7a352a4a8170a78777c01a04ac3f0ed
Signed-off-by: Rebecca Schultz Zavin <0ab09b420c3f4f686e1f6503c93d3111d2038689@android.com>
Git-commit: 78290a298e0659e016d9baae186dc8faed0a0382
Git-repo: https://android.googlesource.com/kernel/common
Signed-off-by: Laura Abbott <e7b4910f4742918f5926c991d8a2cd122ac7e295@codeaurora.org>

TeamVee-Kanas/android_kernel_samsung_kanas,TeamVee-Kanas/android_kernel_samsung_kanas,TeamVee-Kanas/android_kernel_samsung_kanas,TeamVee-Kanas/android_kernel_samsung_kanas,TeamVee-Kanas/android_kernel_samsung_kanas