ion: fix crash when alloc len is -1
If userspace passes a length between -4095 and -1 to allocate it
will pass the len != 0 check, but when len is page aligned it will
be 0. Check len after page aligning.
Drop the warning as well, userspace shouldn't be able to trigger
a warning in the kernel.
Signed-off-by: Colin Cross <ccross@android.com>
Signed-off-by: John Stultz <john.stultz@linaro.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
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