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jam: M: don't require a current file to operate (from 9front, thanks umbraticus)

--- a/sys/src/cmd/jam/xec.c

+++ b/sys/src/cmd/jam/xec.c

@@ -26,7 +26,7 @@

 	if(f && f->unread)

 		load(f);

 	if(f==0 && (cp->addr==0 || cp->addr->type!='"') &&

-	    !utfrune("bBnqUXY!^", cp->cmdc) &&

+	    !utfrune("bBnqUXY!^M", cp->cmdc) &&

 	    cp->cmdc!=('c'|0x100) && !(cp->cmdc=='D' && cp->ctext))

 		error(Enofile);

 	i = lookup(cp->cmdc);