fs/aio: Corrrect some backward tests in aio_read() and aio_write(): Socket...

fs/aio: Corrrect some backward tests in aio_read() and aio_write(): Socket descriptors have higher numbers than file descriptors.  In aio_contain(),  Copy u.ptr (void *) when initializing aioc and not the case specific u.aioc_filep.  From Michal Ulianko.