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While the Kindle chargers are capable of outputting up to 850ma, the Kindle will charge fine, though slightly slower when connected to a computer's standard USB port which can only be expected to provide a maximum of 500ma.
In fact, computer ports often provide less, typically when another USB device is connected to its sister port. USB ports are generally configured in pairs with a total of 500ma available to the pair.
Connecting your Kindle to a charger limited to 450ma will not injure the Kindle. The only possible injury would be to the charger, though this is extremely unlikely with modern electronically regulated chargers.
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