mb/dell/optiplex_9020: Fix UB in package power calculation

Fix potential undefined behaviour in the `get_pkg_power()` function:
- If `rapl_power_unit == 0`, `pkg_power_info / rapl_power_unit` is
  invalid
- If `rapl_power_unit > 7`, the result of the shift doesn't fit into a
  `uint8_t`

Signed-off-by: Mate Kukri <km@mkukri.xyz>
Change-Id: I48ef59c4fbeb0a55675ac24da31e6e0b194cb58d
Reviewed-on: https://review.coreboot.org/c/coreboot/+/83736
Reviewed-by: Angel Pons <th3fanbus@gmail.com>
Reviewed-by: Nico Huber <nico.h@gmx.de>
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Elyes Haouas <ehaouas@noos.fr>

0 files changed, 0 insertions, 0 deletions