[PATCH bpf] riscv, bpf: Fix potential NULL dereference

[Jakub Kicinski]

On Thu, 28 Oct 2021 14:51:15 +0200 Björn Töpel wrote:
> The bpf_jit_binary_free() function requires a non-NULL argument. When
> the RISC-V BPF JIT fails to converge in NR_JIT_ITERATIONS steps,
> jit_data->header will be NULL, which triggers a NULL
> dereference. Avoid this by checking the argument, prior calling the
> function.
> 
> Fixes: ca6cb5447cec ("riscv, bpf: Factor common RISC-V JIT code")
> Signed-off-by: Björn Töpel <bjorn at kernel.org>

Looks pretty trivial so applied to net with Daniel's off-list blessing.