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thread raising: fix off by one

When raising a thread, we were miscounting the number
of lines to select and move.

--- a/mbox.c

+++ b/mbox.c

@@ -678,8 +678,7 @@

 			nr = r->nsub;

 			if(!(r->state & Sdummy))

 				nr++;

-			assert(nr > 0);

-			fprint(mbox.addr, "%d,%d", ln, ln+nr-1);

+			fprint(mbox.addr, "%d,%d", ln, ln+nr);

 			write(mbox.data, "", 0);

 			reinsert(r);

 		}