malloc could leak memory

[Alexandre Oliva]

In the unlikely case of failure of the sbrk() that attempts to align
the sbrk to a page boundary, we'd leak the whole chunk of memory
previously allocated.  This patch corrects this problem, by leaving
the top of the heap misaligned and attempting to correct it next
time.  I'm checking this in, approved by Jeff Johnston.

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-- 
Alexandre Oliva   Enjoy Guarana', see http://www.ic.unicamp.br/~oliva/
Red Hat GCC Developer                  aoliva@{cygnus.com, redhat.com}
CS PhD student at IC-Unicamp        oliva@{lsd.ic.unicamp.br, gnu.org}
Free Software Evangelist                Professional serial bug killer