Okay, this is a little weird, but. . .
IF that bonehead hadn't kept the ball and caused the penalty, and assuming the extra point was made. . .
Then LSU would not have gone for it on 4th and short for the TD late in the game - they would have kicked the easy 3 (assuming they make it).
All else would be the same until the end, as a kickoff would have gotten, if anything, slightly better field position for Oregon State. But Oregon State would have run the same type of running plays, and USC would have made the same type of passing plays for a last minute TD.
So, in the end, LSU by scoring the last drive TD would have won the game without an overtime.
Maybe that bonehead gave Oregon State a shot at overtime.