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H A Dbase.c6ec871d26977d559d1ca65f5b62ada5967bf293c Fri Oct 31 02:33:37 UTC 2025 Govindraj Raja <govindraj.raja@arm.com> fix(scmi): fix coverity issue INTEGER_OVERFLOW

Use round_up_overflow to avoid any integer overflow from
protocol count.

Thsi fixes below coverity issue -

CID 457880: (#1 of 1): Overflowed constant (INTEGER_OVERFLOW)
4. overflow_const: Expression count - 1U, where count is known
to be equal to 0, underflows the type of count - 1U, which is
type unsigned int.

Change-Id: Ib55599fcb2a522e57271a6a07fb9bfd07e6953b9
Signed-off-by: Govindraj Raja <govindraj.raja@arm.com>