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Andrew,
The AVR-325 only puts out 50wpc, so no issue.
If your friend picks a more powerful receiver, then theoretically he could damage the volume control. In practice, however, it's not likely since it would require setting the receiver at full output and using the outdoor volume control to pad the level down to something reasonable.
Patio speakers are typically just for background music, so if you set the receiver volume to just "moderately loud" and pad the level down from there with the outdoor control, your pretty safe with just about any receiver/speaker combo. On those rare occasions that you really want to rock on the patio, leave the outdoor level control at full (effectively taking it out of the loop) and adjust volume with the receiver.
Considering all of the hassle wiring a volume control on the patio (cutting into walls and such), your friend might want to look into an IR repeater to allow the use of the receiver's remote on the patio.
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