[tree-ssa] Fix bootstrap failure in tree-ssa-ccp:set_rhs

[law@redhat.com]

In message <1053430083.19956.89.camel@frodo.toronto.redhat.com>, Diego Novillo 
writes:
 >
 >--=-FzG4+hh75+Q6NsK6CU8P
 >Content-Type: text/plain
 >Content-Transfer-Encoding: 7bit
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 >
 >A typo in an assignment was causing a stage1 failure because of a
 >warning.
Very odd -- I wasn't seeing that failure.  Very very odd.

Anyway, thanks for fixing it.

jeff