tools/mm/page-types: fix ternary operator precedence in sigbus handler

tools/mm/page-types: fix ternary operator precedence in sigbus handler

The ternary operator (?:) has lower precedence than addition (+), so the
expression `off + sigbus_addr ?  sigbus_addr - ptr : 0` was parsed as
`(off + sigbus_addr) ?  (sigbus_addr - ptr) : 0` rather than the intended
`off + (sigbus_addr ?  sigbus_addr - ptr : 0)`.  Add explicit parentheses
to ensure the correct evaluation order.

Link: https://lore.kernel.org/20260513022120.58033-3-ye.liu@linux.dev
Signed-off-by: Ye Liu <liuye@kylinos.cn>
Acked-by: SeongJae Park <sj@kernel.org>
Cc: David Hildenbrand (Arm) <david@kernel.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>