arm: dma-mapping: handle IOVA address zero

The IOVA allocator used by these calls supports IOVA address
zero so properly handle IOVA address zero.

Change-Id: I012452d4cf3534dfb79e6deb15b7ff74f5e3bb40
Signed-off-by: Liam Mark <lmark@codeaurora.org>
Signed-off-by: Patrick Daly <pdaly@codeaurora.org>
1 file changed