hw/smc91c111: Add explicit 'return' rather than relying on fallthrough
Add an explicit 'return' statement to a case in smc91c111_readb rather than relying on fallthrough to the following case's return statement, for code clarity and to placate static analysers. Signed-off-by: NPeter Maydell <peter.maydell@linaro.org> Signed-off-by: NBlue Swirl <blauwirbel@gmail.com>
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