During code review, I noticed we were passing a bad buffer pointer
to bpf_load_pointer helper function called by jitted code.

Point to the buffer allocated by JIT, so we don't silently corrupt
other parts of the stack.
Signed-off-by: NZi Shen Lim <zlim.lnx@gmail.com>
Acked-by: NYang Shi <yang.shi@linaro.org>
Signed-off-by: NDavid S. Miller <davem@davemloft.net>