patch for presumed typo in boehm-gc/misc.c

[Per Bothner]

"Boehm, Hans" <hans_boehm@hp.com> writes:

> (I suspect you were building without -O and the rest of us weren't.
> -O builds probably work as it stands.)

Yes - I was trying to debug jc1, so configured with CFLAGS=-g.
-- 
	--Per Bothner
per@bothner.com   http://www.bothner.com/~per/