gpu: ion: Return negative value from ioctl on allocation failure

If the ion allocation fails, return a negative value to the
ioctl. This is easier for userspace to deal with than
checking if the handle is valid.

Change-Id: I1c785b1b1e71d2bd45c6f7be78ea15e4a08cd6e5
Signed-off-by: Laura Abbott <lauraa@codeaurora.org>
1 file changed