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hjfs: unlimited buffer works

Due to malloc cap, a buffer above 2G
would cause malloc to fail. This caused
inst/mounthjfs to error if the system had
over ~8G of ram.

--- a/sys/src/cmd/hjfs/buf.c

+++ b/sys/src/cmd/hjfs/buf.c

@@ -240,7 +240,9 @@

 	Buf *b;

 	fmtinstall('T', Tfmt);

-	b = emalloc(sizeof(*b) * nbuf);

+	b = sbrk(sizeof(*b) * (vlong)nbuf);

+	if(b == (void*)-1)

+		sysfatal("sbrk: %r");

 	bfree.fnext = bfree.fprev = &bfree;

 	while(nbuf--)

 		markfree(b++);