video: mb862xxfb: prevent divide by zero bug
Do a sanity check on these before using them as divisors. Signed-off-by: Dan Carpenter <dan.carpenter@oracle.com> Acked-by: Anatolij Gustschin <agust@denx.de> Signed-off-by: Florian Tobias Schandinat <FlorianSchandinat@gmx.de>
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