nb/intel/pineview: Correct lsbpos(0) and msbpos(0)

lsbpos and msbpos have incorrect behaviour when given 0.
lsbpos(0) returns 8, and msbpos(0) hangs. The latter is
because the check i >= 0 is always true for an unsigned
integer, causing it to loop indefinitely (this was flagged
by Coverity).

0 doesn't have a lsb or msb position, so we change both
functions to return -1 in this case to indicate an error.
The code already guards against calling these functions
with 0, but we make this more explicit to prevent errors
in the future.

Found-by: Coverity Scan, CID 1347356, 1347386
Signed-off-by: Jacob Garber <jgarber1@ualberta.ca>
Change-Id: Ic5be50846cc545dcd48593e5ed3fd6068a6104cb
Reviewed-on: https://review.coreboot.org/c/coreboot/+/32054
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Paul Menzel <paulepanter@users.sourceforge.net>
Reviewed-by: Patrick Georgi <pgeorgi@google.com>

0 files changed, 0 insertions, 0 deletions