hw/misc/pca9554: Correct error check bounds in get/set pin functions

hw/misc/pca9554: Correct error check bounds in get/set pin functions

In pca9554_get_pin() and pca9554_set_pin(), we try to detect an
incorrect pin value, but we get the condition wrong, using ">"
when ">=" was intended.

This has no actual effect, because in pca9554_initfn() we
use the correct test when creating the properties and so
we'll never be called with an out of range value. However,
Coverity complains about the mismatch between the check and
the later use of the pin value in a shift operation.

Use the correct condition.

Resolves: Coverity CID 1534917
Signed-off-by: Peter Maydell <peter.maydell@linaro.org>
Reviewed-by: Richard Henderson <richard.henderson@linaro.org>
Reviewed-by: Thomas Huth <thuth@redhat.com>
Message-id: 20240312183810.557768-5-peter.maydell@linaro.org