lib/list_debug.c: add object information in case of invalid object

As of now during link list corruption it prints about cluprit address and
its wrong value, but sometime it is not enough to catch the actual issue
point.

If it prints allocation and free path of that corrupted node, it will be a
lot easier to find and fix the issues.

Adding the same information when data mismatch is found in link list
debug data:

[   14.243055]  slab kmalloc-32 start ffff0000cda19320 data offset 32 pointer offset 8 size 32 allocated at add_to_list+0x28/0xb0
[   14.245259]     __kmalloc_cache_noprof+0x1c4/0x358
[   14.245572]     add_to_list+0x28/0xb0
...
[   14.248632]     do_el0_svc_compat+0x1c/0x34
[   14.249018]     el0_svc_compat+0x2c/0x80
[   14.249244]  Free path:
[   14.249410]     kfree+0x24c/0x2f0
[   14.249724]     do_force_corruption+0xbc/0x100
...
[   14.252266]     el0_svc_common.constprop.0+0x40/0xe0
[   14.252540]     do_el0_svc_compat+0x1c/0x34
[   14.252763]     el0_svc_compat+0x2c/0x80
[   14.253071] ------------[ cut here ]------------
[   14.253303] list_del corruption. next->prev should be ffff0000cda192a8, but was 6b6b6b6b6b6b6b6b. (next=ffff0000cda19348)
[   14.254255] WARNING: CPU: 3 PID: 84 at lib/list_debug.c:65 __list_del_entry_valid_or_report+0x158/0x164

Moved prototype of mem_dump_obj() to bug.h, as mm.h can not be included in
bug.h.

Link: https://lkml.kernel.org/r/20241230101043.53773-1-maninder1.s@samsung.com


Signed-off-by: Maninder Singh <maninder1.s@samsung.com>
Acked-by: Jan Kara <jack@suse.cz>
Cc: Al Viro <viro@zeniv.linux.org.uk>
Cc: Christian Brauner <brauner@kernel.org>
Cc: Marco Elver <elver@google.com>
Cc: Rohit Thapliyal <r.thapliyal@samsung.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>