Ever since I've updated to ICS, I find that I accidently turn my phone off in my pocket. The power button will now bring up a screen to turn off the phone even if I don't unlock the screen, and my butt will turn off the phone. Of course, since it's in my pocket, I don't notice for a while and I'm missing calls/emails.

How can I change it so that it won't bring up the power screen?