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tighten assertion: >= 0 to >0

--- a/mbox.c

+++ b/mbox.c

@@ -672,7 +672,7 @@

 		if(r->nsub > 0){

 			ln = mesglineno(r, nil);

 			nr = r->nsub + (r->flags & Fdummy) ? 0 : 1;

-			assert(nr >= 0);

+			assert(nr > 0);

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

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

 			reinsert(r);