I can obviously see the potential for a problem, but I haven't had any issues...
I was forced to do this in the rear when I started using my BOB trailer... the fender supports, which already had to be bent to clear the disc brake, got in the way of the fork of the trailer...there's a lot going on right there with discs, fenders, and a trailer. So I shortened the fender supports and used the actual brake caliper mounting bolt to secure both the brake and the fender. You can sort of see what I did in this picture:
now my homemade tab on the front of the bike has broken (rickety hose-clamp situation) and I'm thinking I'll do the same thing with the disc caliper mount up front. I haven't had any issues with the back.
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