ion: msm: fix bug with handle id handling

0 is not a valid handle id value. If we get a 0 we should try to do the
dma_buf import.

Change-Id: I2b9355a5ad65c91247c0369047f921cf02908b1c
Signed-off-by: Mitchel Humpherys <mitchelh@codeaurora.org>
1 file changed