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upas/fs: remove useless loop in rf822()

--- a/sys/src/cmd/upas/fs/mbox.c

+++ b/sys/src/cmd/upas/fs/mbox.c

@@ -867,15 +867,12 @@

 	n = getfields(s, f, nelem(f), 1, "<> \n\t\r,");

 	if(n > Nref)

 		n = Nref;

-	a = m->references;

-	for(i = 0; i < Nref; i++)

-		if(a[i] == nil)

-			break;

 	/*

 	 * if there are too many references, drop from the beginning

 	 * of the list. If someone else has a duplicate, we keep the

 	 * old duplicate.

 	 */

+	a = m->references;

 	for(i = 0; i < n; i++){

 		for(j = 0; j < Nref; j++)

 			if(a[j] == nil || strcmp(a[j], f[i]) == 0)