bpf, sparc: remove unused variable

Since fe83963b ("bpf, sparc64: remove ld_abs/ld_ind") it's not
used anymore therefore remove it.
Signed-off-by: Daniel Borkmann <daniel@iogearbox.net>
Acked-by: David S. Miller <davem@davemloft.net>
Signed-off-by: Alexei Starovoitov <ast@kernel.org>

arch/sparc/net/bpf_jit_comp_64.c

@@ -894,7 +894,6 @@ static int build_insn(const struct bpf_insn *insn, struct jit_ctx *ctx)
 	const int i = insn - ctx->prog->insnsi;
 	const s16 off = insn->off;
 	const s32 imm = insn->imm;
-	u32 *func;
 
 	if (insn->src_reg == BPF_REG_FP)
 		ctx->saw_frame_pointer = true;