staging: android: ashmem: Shrink directly through shmem_fallocate

When ashmem_shrink is called from direct reclaim on a user thread, a
call to do_fallocate will check for permissions against the security
policy of that user thread.  It can thus fail by chance if called on a
thread that isn't permitted to modify the relevant ashmem areas.

Because we know that we have a shmem file underneath, call the shmem
implementation of fallocate directly instead of going through the
user-space interface for fallocate.

Signed-off-by: Tobias Lindskog <[email protected]>
Signed-off-by: Jeff Vander Stoep <[email protected]>
Signed-off-by: Joel Fernandes (Google) <[email protected]>
Signed-off-by: Greg Kroah-Hartman <[email protected]>

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