bpf: opcodes: fix regression in BPF disassembler

bpf: opcodes: fix regression in BPF disassembler

This patch fixes a regression recently introduced in the BPF
disassembler, that was assuming an abfd was always available in
info->section->owner.  Apparently this is not so in GDB, and therefore
https://sourceware.org/bugzilla/show_bug.cgi?id=30705.

Tested in bpf-unkonwn-none.

opcodes/ChangeLog:

2023-07-31  Jose E. Marchesi  <jose.marchesi@oracle.com>

	PR 30705
	* bpf-dis.c (print_insn_bpf): Check that info->section->owner is
	actually available before using it.