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There are two ways to call an 'early' election - the first is for two thirds of MPs to vote for one; the second is for a vote of no confidence from within the ruling party.
Both of these routes are dodgy, but we are in dodgy times. The Government has a majority of 12, which means that in reality, it is actually in a worse position than when it had the Lib Dems propping it up. With Brexit negotiations ahead, they might fancy increasing that number - as they almost certainly would with an election.
The dodgy part is Labour's role - so under any sensible standard, if a Government wants to call an election, it follows that they are in a position of power and therefore, the opposition would resist, thus making difficult obtaining two thirds. However, the Labour PLP really are in the back of the cupboard looking for any way possible to get rid of Corbyn, so a hammering at an election would be just about the best way to do it. The risk, of course, is that as individual MPs, they could lose their own seat. Having said all of this, I note now that Corbyn is saying that he might not go even if he did lose an election, which fits with my own view that JC has no interest in actually being PM, he simply wants an opposition that fits with his ideology.
The vote of no confidence in yourself route would be madness, but you just never know...